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.deps...github...OpenZeppelin...openzeppelin-contracts...contracts...access...Ownable.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../utils/Context.sol";
/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

.deps...github...OpenZeppelin...openzeppelin-contracts...contracts...token...ERC20...ERC20.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC20.sol";
import "./extensions/IERC20Metadata.sol";
import "../../utils/Context.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin guidelines: functions revert instead
 * of returning `false` on failure. This behavior is nonetheless conventional
 * and does not conflict with the expectations of ERC20 applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping (address => uint256) private _balances;

    mapping (address => mapping (address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * The defaut value of {decimals} is 18. To select a different value for
     * {decimals} you should overload it.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor (string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5,05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless this function is
     * overridden;
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * Requirements:
     *
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);

        uint256 currentAllowance = _allowances[sender][_msgSender()];
        require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
        _approve(sender, _msgSender(), currentAllowance - amount);

        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender] + addedValue);
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        uint256 currentAllowance = _allowances[_msgSender()][spender];
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        _approve(_msgSender(), spender, currentAllowance - subtractedValue);

        return true;
    }

    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * This is internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(address sender, address recipient, uint256 amount) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        uint256 senderBalance = _balances[sender];
        require(senderBalance >= amount, "ERC20: transfer amount exceeds balance");
        _balances[sender] = senderBalance - amount;
        _balances[recipient] += amount;

        emit Transfer(sender, recipient, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply += amount;
        _balances[account] += amount;
        emit Transfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        _balances[account] = accountBalance - amount;
        _totalSupply -= amount;

        emit Transfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 amount) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be to transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }
}

.deps...github...OpenZeppelin...openzeppelin-contracts...contracts...token...ERC20...extensions...IERC20Metadata.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

.deps...github...OpenZeppelin...openzeppelin-contracts...contracts...token...ERC20...IERC20.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

.deps...github...OpenZeppelin...openzeppelin-contracts...contracts...utils...Address.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: value }(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

.deps...github...OpenZeppelin...openzeppelin-contracts...contracts...utils...Context.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

.deps...github...OpenZeppelin...openzeppelin-contracts...contracts...utils...math...SafeMath.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

// CAUTION
// This version of SafeMath should only be used with Solidity 0.8 or later,
// because it relies on the compiler's built in overflow checks.

/**
 * @dev Wrappers over Solidity's arithmetic operations.
 *
 * NOTE: `SafeMath` is no longer needed starting with Solidity 0.8. The compiler
 * now has built in overflow checking.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            uint256 c = a + b;
            if (c < a) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b > a) return (false, 0);
            return (true, a - b);
        }
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
            // benefit is lost if 'b' is also tested.
            // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
            if (a == 0) return (true, 0);
            uint256 c = a * b;
            if (c / a != b) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a / b);
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a % b);
        }
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        return a + b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        return a * b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator.
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        unchecked {
            require(b <= a, errorMessage);
            return a - b;
        }
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a / b;
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a % b;
        }
    }
}

README.txt

REMIX EXAMPLE PROJECT

Remix example project is present when Remix loads very first time or there are no files existing in the File Explorer. 
It contains 3 directories:

1. 'contracts': Holds three contracts with different complexity level, denoted with number prefix in file name.
2. 'scripts': Holds two scripts to deploy a contract. It is explained below.
3. 'tests': Contains one test file for 'Ballot' contract with unit tests in Solidity.

SCRIPTS

The 'scripts' folder contains example async/await scripts for deploying the 'Storage' contract.
For the deployment of any other contract, 'contractName' and 'constructorArgs' should be updated (along with other code if required). 
Scripts have full access to the web3.js and ethers.js libraries.

To run a script, right click on file name in the file explorer and click 'Run'. Remember, Solidity file must already be compiled.

Output from script will appear in remix terminal.

contracts...artifacts...GFI_Token.json

{
	"deploy": {
		"VM:-": {
			"linkReferences": {},
			"autoDeployLib": true
		},
		"main:1": {
			"linkReferences": {},
			"autoDeployLib": true
		},
		"ropsten:3": {
			"linkReferences": {},
			"autoDeployLib": true
		},
		"rinkeby:4": {
			"linkReferences": {},
			"autoDeployLib": true
		},
		"kovan:42": {
			"linkReferences": {},
			"autoDeployLib": true
		},
		"görli:5": {
			"linkReferences": {},
			"autoDeployLib": true
		},
		"Custom": {
			"linkReferences": {},
			"autoDeployLib": true
		}
	},
	"data": {
		"bytecode": {
			"generatedSources": [],
			"linkReferences": {},
			"object": "",
			"opcodes": "",
			"sourceMap": ""
		},
		"deployedBytecode": {
			"generatedSources": [],
			"immutableReferences": {},
			"linkReferences": {},
			"object": "",
			"opcodes": "",
			"sourceMap": ""
		},
		"gasEstimates": null,
		"methodIdentifiers": {
			"balanceOf(address)": "70a08231",
			"transfer(address,uint256)": "a9059cbb",
			"transferFrom(address,address,uint256)": "23b872dd"
		}
	},
	"abi": [
		{
			"inputs": [
				{
					"internalType": "address",
					"name": "owner",
					"type": "address"
				}
			],
			"name": "balanceOf",
			"outputs": [
				{
					"internalType": "uint256",
					"name": "",
					"type": "uint256"
				}
			],
			"stateMutability": "nonpayable",
			"type": "function"
		},
		{
			"inputs": [
				{
					"internalType": "address",
					"name": "to",
					"type": "address"
				},
				{
					"internalType": "uint256",
					"name": "amount",
					"type": "uint256"
				}
			],
			"name": "transfer",
			"outputs": [
				{
					"internalType": "bool",
					"name": "",
					"type": "bool"
				}
			],
			"stateMutability": "nonpayable",
			"type": "function"
		},
		{
			"inputs": [
				{
					"internalType": "address",
					"name": "_from",
					"type": "address"
				},
				{
					"internalType": "address",
					"name": "_to",
					"type": "address"
				},
				{
					"internalType": "uint256",
					"name": "_value",
					"type": "uint256"
				}
			],
			"name": "transferFrom",
			"outputs": [
				{
					"internalType": "bool",
					"name": "success",
					"type": "bool"
				}
			],
			"stateMutability": "nonpayable",
			"type": "function"
		}
	]
}

contracts...artifacts...GFI_Token_metadata.json

{
	"compiler": {
		"version": "0.8.3+commit.8d00100c"
	},
	"language": "Solidity",
	"output": {
		"abi": [
			{
				"inputs": [
					{
						"internalType": "address",
						"name": "owner",
						"type": "address"
					}
				],
				"name": "balanceOf",
				"outputs": [
					{
						"internalType": "uint256",
						"name": "",
						"type": "uint256"
					}
				],
				"stateMutability": "nonpayable",
				"type": "function"
			},
			{
				"inputs": [
					{
						"internalType": "address",
						"name": "to",
						"type": "address"
					},
					{
						"internalType": "uint256",
						"name": "amount",
						"type": "uint256"
					}
				],
				"name": "transfer",
				"outputs": [
					{
						"internalType": "bool",
						"name": "",
						"type": "bool"
					}
				],
				"stateMutability": "nonpayable",
				"type": "function"
			},
			{
				"inputs": [
					{
						"internalType": "address",
						"name": "_from",
						"type": "address"
					},
					{
						"internalType": "address",
						"name": "_to",
						"type": "address"
					},
					{
						"internalType": "uint256",
						"name": "_value",
						"type": "uint256"
					}
				],
				"name": "transferFrom",
				"outputs": [
					{
						"internalType": "bool",
						"name": "success",
						"type": "bool"
					}
				],
				"stateMutability": "nonpayable",
				"type": "function"
			}
		],
		"devdoc": {
			"kind": "dev",
			"methods": {},
			"version": 1
		},
		"userdoc": {
			"kind": "user",
			"methods": {},
			"version": 1
		}
	},
	"settings": {
		"compilationTarget": {
			"contracts/Gravity_Sale.sol": "GFI_Token"
		},
		"evmVersion": "istanbul",
		"libraries": {},
		"metadata": {
			"bytecodeHash": "ipfs"
		},
		"optimizer": {
			"enabled": false,
			"runs": 200
		},
		"remappings": []
	},
	"sources": {
		"contracts/Gravity_Sale.sol": {
			"keccak256": "0x368d5ba582633d811efe8b95687f8610600be8270e25cba9d9512c468c613a9a",
			"license": "MIT",
			"urls": [
				"bzz-raw://e378d3a0a1957139a19151d86284f7ceb52fcf496d049057ce2588cdaefd3a53",
				"dweb:/ipfs/Qmc9tDecyQmYAFnWNkNWhpViYeCQH5DVwn24udZdCZAbFM"
			]
		},
		"https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/access/Ownable.sol": {
			"keccak256": "0x1cae4f85f114ff17b90414f5da67365b1d00337abb5bce9bf944eb78a2c0673c",
			"license": "MIT",
			"urls": [
				"bzz-raw://d5ff16b336ce8f906478d5f2eecc6435e00833bdc0b92f6b209cf9e92cb5b2b7",
				"dweb:/ipfs/QmRD1rAZEqQ73C33cdA3QoUyBDMEWnNKNMc6PNkAZWHeQQ"
			]
		},
		"https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/Context.sol": {
			"keccak256": "0xf930d2df426bfcfc1f7415be724f04081c96f4fb9ec8d0e3a521c07692dface0",
			"license": "MIT",
			"urls": [
				"bzz-raw://fc2bfdea0d2562c76fb3c4cf70a86c6ba25c5a30e8f8515c95aafdf8383f8395",
				"dweb:/ipfs/QmTbFya18786ckJfLYUoWau9jBTKfmWnWm5XSViWvB7PXN"
			]
		}
	},
	"version": 1
}

contracts...artifacts...GravityFinance.json

// this line is added to create a gist. Empty file is not allowed.

contracts...artifacts...GravityFinance_metadata.json

{
	"compiler": {
		"version": "0.8.3+commit.8d00100c"
	},
	"language": "Solidity",
	"output": {
		"abi": [
			{
				"inputs": [],
				"stateMutability": "nonpayable",
				"type": "constructor"
			},
			{
				"anonymous": false,
				"inputs": [
					{
						"indexed": false,
						"internalType": "uint256",
						"name": "tokenID",
						"type": "uint256"
					},
					{
						"indexed": false,
						"internalType": "contract IERC20",
						"name": "tokenAddress",
						"type": "address"
					},
					{
						"indexed": false,
						"internalType": "string",
						"name": "tokenName",
						"type": "string"
					}
				],
				"name": "AddNewToken",
				"type": "event"
			},
			{
				"anonymous": false,
				"inputs": [
					{
						"indexed": true,
						"internalType": "address",
						"name": "owner",
						"type": "address"
					},
					{
						"indexed": true,
						"internalType": "address",
						"name": "spender",
						"type": "address"
					},
					{
						"indexed": false,
						"internalType": "uint256",
						"name": "value",
						"type": "uint256"
					}
				],
				"name": "Approval",
				"type": "event"
			},
			{
				"anonymous": false,
				"inputs": [
					{
						"indexed": false,
						"internalType": "uint256",
						"name": "amount",
						"type": "uint256"
					}
				],
				"name": "EthDividendWithdraw",
				"type": "event"
			},
			{
				"anonymous": false,
				"inputs": [
					{
						"indexed": true,
						"internalType": "address",
						"name": "previousOwner",
						"type": "address"
					},
					{
						"indexed": true,
						"internalType": "address",
						"name": "newOwner",
						"type": "address"
					}
				],
				"name": "OwnershipTransferred",
				"type": "event"
			},
			{
				"anonymous": false,
				"inputs": [
					{
						"indexed": true,
						"internalType": "address",
						"name": "from",
						"type": "address"
					},
					{
						"indexed": true,
						"internalType": "address",
						"name": "to",
						"type": "address"
					},
					{
						"indexed": false,
						"internalType": "uint256",
						"name": "value",
						"type": "uint256"
					}
				],
				"name": "Transfer",
				"type": "event"
			},
			{
				"inputs": [
					{
						"internalType": "uint256",
						"name": "",
						"type": "uint256"
					}
				],
				"name": "TokenInfo",
				"outputs": [
					{
						"internalType": "uint256",
						"name": "tokenID",
						"type": "uint256"
					},
					{
						"internalType": "contract IERC20",
						"name": "tokenAddress",
						"type": "address"
					},
					{
						"internalType": "string",
						"name": "tokenName",
						"type": "string"
					},
					{
						"internalType": "bool",
						"name": "isValidToken",
						"type": "bool"
					},
					{
						"internalType": "uint8",
						"name": "decimals",
						"type": "uint8"
					}
				],
				"stateMutability": "view",
				"type": "function"
			},
			{
				"inputs": [
					{
						"internalType": "uint256",
						"name": "amount",
						"type": "uint256"
					}
				],
				"name": "_burn",
				"outputs": [],
				"stateMutability": "nonpayable",
				"type": "function"
			},
			{
				"inputs": [
					{
						"internalType": "string",
						"name": "_tokenName",
						"type": "string"
					},
					{
						"internalType": "contract IERC20",
						"name": "_newTokenAddress",
						"type": "address"
					},
					{
						"internalType": "uint8",
						"name": "_dec",
						"type": "uint8"
					}
				],
				"name": "addNewToken",
				"outputs": [
					{
						"internalType": "bool",
						"name": "success",
						"type": "bool"
					}
				],
				"stateMutability": "nonpayable",
				"type": "function"
			},
			{
				"inputs": [
					{
						"internalType": "address",
						"name": "owner",
						"type": "address"
					},
					{
						"internalType": "address",
						"name": "spender",
						"type": "address"
					}
				],
				"name": "allowance",
				"outputs": [
					{
						"internalType": "uint256",
						"name": "",
						"type": "uint256"
					}
				],
				"stateMutability": "view",
				"type": "function"
			},
			{
				"inputs": [
					{
						"internalType": "address",
						"name": "spender",
						"type": "address"
					},
					{
						"internalType": "uint256",
						"name": "amount",
						"type": "uint256"
					}
				],
				"name": "approve",
				"outputs": [
					{
						"internalType": "bool",
						"name": "",
						"type": "bool"
					}
				],
				"stateMutability": "nonpayable",
				"type": "function"
			},
			{
				"inputs": [
					{
						"internalType": "address",
						"name": "account",
						"type": "address"
					}
				],
				"name": "balanceOf",
				"outputs": [
					{
						"internalType": "uint256",
						"name": "",
						"type": "uint256"
					}
				],
				"stateMutability": "view",
				"type": "function"
			},
			{
				"inputs": [],
				"name": "decimals",
				"outputs": [
					{
						"internalType": "uint8",
						"name": "",
						"type": "uint8"
					}
				],
				"stateMutability": "view",
				"type": "function"
			},
			{
				"inputs": [
					{
						"internalType": "address",
						"name": "spender",
						"type": "address"
					},
					{
						"internalType": "uint256",
						"name": "subtractedValue",
						"type": "uint256"
					}
				],
				"name": "decreaseAllowance",
				"outputs": [
					{
						"internalType": "bool",
						"name": "",
						"type": "bool"
					}
				],
				"stateMutability": "nonpayable",
				"type": "function"
			},
			{
				"inputs": [
					{
						"internalType": "address",
						"name": "spender",
						"type": "address"
					},
					{
						"internalType": "uint256",
						"name": "addedValue",
						"type": "uint256"
					}
				],
				"name": "increaseAllowance",
				"outputs": [
					{
						"internalType": "bool",
						"name": "",
						"type": "bool"
					}
				],
				"stateMutability": "nonpayable",
				"type": "function"
			},
			{
				"inputs": [],
				"name": "name",
				"outputs": [
					{
						"internalType": "string",
						"name": "",
						"type": "string"
					}
				],
				"stateMutability": "view",
				"type": "function"
			},
			{
				"inputs": [],
				"name": "owner",
				"outputs": [
					{
						"internalType": "address",
						"name": "",
						"type": "address"
					}
				],
				"stateMutability": "view",
				"type": "function"
			},
			{
				"inputs": [],
				"name": "prediction_addr",
				"outputs": [
					{
						"internalType": "address",
						"name": "",
						"type": "address"
					}
				],
				"stateMutability": "view",
				"type": "function"
			},
			{
				"inputs": [],
				"name": "renounceOwnership",
				"outputs": [],
				"stateMutability": "nonpayable",
				"type": "function"
			},
			{
				"inputs": [
					{
						"internalType": "address",
						"name": "",
						"type": "address"
					}
				],
				"name": "scaledDividendBalanceOf",
				"outputs": [
					{
						"internalType": "uint256",
						"name": "",
						"type": "uint256"
					}
				],
				"stateMutability": "view",
				"type": "function"
			},
			{
				"inputs": [
					{
						"internalType": "address",
						"name": "",
						"type": "address"
					}
				],
				"name": "scaledDividendCreditedTo",
				"outputs": [
					{
						"internalType": "uint256",
						"name": "",
						"type": "uint256"
					}
				],
				"stateMutability": "view",
				"type": "function"
			},
			{
				"inputs": [],
				"name": "scaledDividendPerToken",
				"outputs": [
					{
						"internalType": "uint256",
						"name": "",
						"type": "uint256"
					}
				],
				"stateMutability": "view",
				"type": "function"
			},
			{
				"inputs": [],
				"name": "scaledRemainder",
				"outputs": [
					{
						"internalType": "uint256",
						"name": "",
						"type": "uint256"
					}
				],
				"stateMutability": "view",
				"type": "function"
			},
			{
				"inputs": [],
				"name": "scaling",
				"outputs": [
					{
						"internalType": "uint256",
						"name": "",
						"type": "uint256"
					}
				],
				"stateMutability": "view",
				"type": "function"
			},
			{
				"inputs": [],
				"name": "staking_addr",
				"outputs": [
					{
						"internalType": "address",
						"name": "",
						"type": "address"
					}
				],
				"stateMutability": "view",
				"type": "function"
			},
			{
				"inputs": [],
				"name": "symbol",
				"outputs": [
					{
						"internalType": "string",
						"name": "",
						"type": "string"
					}
				],
				"stateMutability": "view",
				"type": "function"
			},
			{
				"inputs": [],
				"name": "tokenCount",
				"outputs": [
					{
						"internalType": "uint256",
						"name": "",
						"type": "uint256"
					}
				],
				"stateMutability": "view",
				"type": "function"
			},
			{
				"inputs": [],
				"name": "tokendistr_addr",
				"outputs": [
					{
						"internalType": "address",
						"name": "",
						"type": "address"
					}
				],
				"stateMutability": "view",
				"type": "function"
			},
			{
				"inputs": [],
				"name": "totalSupply",
				"outputs": [
					{
						"internalType": "uint256",
						"name": "",
						"type": "uint256"
					}
				],
				"stateMutability": "view",
				"type": "function"
			},
			{
				"inputs": [
					{
						"internalType": "address",
						"name": "recipient",
						"type": "address"
					},
					{
						"internalType": "uint256",
						"name": "amount",
						"type": "uint256"
					}
				],
				"name": "transfer",
				"outputs": [
					{
						"internalType": "bool",
						"name": "",
						"type": "bool"
					}
				],
				"stateMutability": "nonpayable",
				"type": "function"
			},
			{
				"inputs": [
					{
						"internalType": "address",
						"name": "sender",
						"type": "address"
					},
					{
						"internalType": "address",
						"name": "recipient",
						"type": "address"
					},
					{
						"internalType": "uint256",
						"name": "amount",
						"type": "uint256"
					}
				],
				"name": "transferFrom",
				"outputs": [
					{
						"internalType": "bool",
						"name": "",
						"type": "bool"
					}
				],
				"stateMutability": "nonpayable",
				"type": "function"
			},
			{
				"inputs": [
					{
						"internalType": "address",
						"name": "newOwner",
						"type": "address"
					}
				],
				"name": "transferOwnership",
				"outputs": [],
				"stateMutability": "nonpayable",
				"type": "function"
			},
			{
				"inputs": [
					{
						"internalType": "uint256",
						"name": "amount",
						"type": "uint256"
					}
				],
				"name": "withdrawAndBurn",
				"outputs": [],
				"stateMutability": "nonpayable",
				"type": "function"
			},
			{
				"inputs": [
					{
						"internalType": "address payable",
						"name": "_address",
						"type": "address"
					}
				],
				"name": "withdrawEthDividends",
				"outputs": [],
				"stateMutability": "nonpayable",
				"type": "function"
			},
			{
				"stateMutability": "payable",
				"type": "receive"
			}
		],
		"devdoc": {
			"kind": "dev",
			"methods": {
				"_burn(uint256)": {
					"details": "Destroys `amount` tokens from `account`, reducing the total supply. Emits a {Transfer} event with `to` set to the zero address. Requirements - `account` cannot be the zero address. - `account` must have at least `amount` tokens."
				},
				"allowance(address,address)": {
					"details": "See {IERC20-allowance}."
				},
				"approve(address,uint256)": {
					"details": "See {IERC20-approve}. Requirements: - `spender` cannot be the zero address."
				},
				"balanceOf(address)": {
					"details": "See {IERC20-balanceOf}."
				},
				"constructor": {
					"details": "Sets the values for {name} and {symbol}, initializes {decimals} with a default value of 18. To select a different value for {decimals}, use {_setupDecimals}. All three of these values are immutable: they can only be set once during construction."
				},
				"decimals()": {
					"details": "Returns the number of decimals used to get its user representation. For example, if `decimals` equals `2`, a balance of `505` tokens should be displayed to a user as `5,05` (`505 / 10 ** 2`). Tokens usually opt for a value of 18, imitating the relationship between Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is called. NOTE: This information is only used for _display_ purposes: it in no way affects any of the arithmetic of the contract, including {IERC20-balanceOf} and {IERC20-transfer}."
				},
				"decreaseAllowance(address,uint256)": {
					"details": "Atomically decreases the allowance granted to `spender` by the caller. This is an alternative to {approve} that can be used as a mitigation for problems described in {IERC20-approve}. Emits an {Approval} event indicating the updated allowance. Requirements: - `spender` cannot be the zero address. - `spender` must have allowance for the caller of at least `subtractedValue`."
				},
				"increaseAllowance(address,uint256)": {
					"details": "Atomically increases the allowance granted to `spender` by the caller. This is an alternative to {approve} that can be used as a mitigation for problems described in {IERC20-approve}. Emits an {Approval} event indicating the updated allowance. Requirements: - `spender` cannot be the zero address."
				},
				"name()": {
					"details": "Returns the name of the token."
				},
				"owner()": {
					"details": "Returns the address of the current owner."
				},
				"renounceOwnership()": {
					"details": "Leaves the contract without owner. It will not be possible to call `onlyOwner` functions anymore. Can only be called by the current owner. NOTE: Renouncing ownership will leave the contract without an owner, thereby removing any functionality that is only available to the owner."
				},
				"symbol()": {
					"details": "Returns the symbol of the token, usually a shorter version of the name."
				},
				"totalSupply()": {
					"details": "See {IERC20-totalSupply}."
				},
				"transfer(address,uint256)": {
					"details": "See {IERC20-transfer}. Requirements: - `recipient` cannot be the zero address. - the caller must have a balance of at least `amount`."
				},
				"transferFrom(address,address,uint256)": {
					"details": "See {IERC20-transferFrom}. Emits an {Approval} event indicating the updated allowance. This is not required by the EIP. See the note at the beginning of {ERC20}; Requirements: - `sender` and `recipient` cannot be the zero address. - `sender` must have a balance of at least `amount`. - the caller must have allowance for ``sender``'s tokens of at least `amount`."
				},
				"transferOwnership(address)": {
					"details": "Transfers ownership of the contract to a new account (`newOwner`). Can only be called by the current owner."
				}
			},
			"version": 1
		},
		"userdoc": {
			"kind": "user",
			"methods": {},
			"version": 1
		}
	},
	"settings": {
		"compilationTarget": {
			"contracts/Gravity_Token.sol": "GravityFinance"
		},
		"evmVersion": "istanbul",
		"libraries": {},
		"metadata": {
			"bytecodeHash": "ipfs"
		},
		"optimizer": {
			"enabled": false,
			"runs": 200
		},
		"remappings": []
	},
	"sources": {
		"contracts/Gravity_Token.sol": {
			"keccak256": "0xf4bdc262dbd7c6368334d6bdb126a325584a85c9d07cc80ef8f9772cec3e8478",
			"license": "MIT",
			"urls": [
				"bzz-raw://0f462ec1d97f9c416b678a43c1ceeebd5b2b18dea2532fde9094997047aa1b3b",
				"dweb:/ipfs/QmQpZNwDkJptKFUXodVttLjhvXdu8VYM8hdHzgCMZTH6n3"
			]
		},
		"https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/access/Ownable.sol": {
			"keccak256": "0x1cae4f85f114ff17b90414f5da67365b1d00337abb5bce9bf944eb78a2c0673c",
			"license": "MIT",
			"urls": [
				"bzz-raw://d5ff16b336ce8f906478d5f2eecc6435e00833bdc0b92f6b209cf9e92cb5b2b7",
				"dweb:/ipfs/QmRD1rAZEqQ73C33cdA3QoUyBDMEWnNKNMc6PNkAZWHeQQ"
			]
		},
		"https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC20/IERC20.sol": {
			"keccak256": "0xf8e8d118a7a8b2e134181f7da655f6266aa3a0f9134b2605747139fcb0c5d835",
			"license": "MIT",
			"urls": [
				"bzz-raw://9ec48567e7ad06acb670980d5cdf3fd7f3949bf12894f02d68c3bb43e75aa84f",
				"dweb:/ipfs/QmaG3R2J9cz92YT77vFjYrjMNU2wHp4ypwYD62HqDUqS5U"
			]
		},
		"https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/Address.sol": {
			"keccak256": "0x069b2631bb5b5193a58ccf7a06266c7361bd2c20095667af4402817605627f45",
			"license": "MIT",
			"urls": [
				"bzz-raw://6a4c96fafff76deda5697c3c5c98cade6e6e1b178254544c106bf360c079ce4e",
				"dweb:/ipfs/QmXmxubE3jnatFgZuN8ay1VV6hZ8WRmhvUjNpeVjki15HX"
			]
		},
		"https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/Context.sol": {
			"keccak256": "0xf930d2df426bfcfc1f7415be724f04081c96f4fb9ec8d0e3a521c07692dface0",
			"license": "MIT",
			"urls": [
				"bzz-raw://fc2bfdea0d2562c76fb3c4cf70a86c6ba25c5a30e8f8515c95aafdf8383f8395",
				"dweb:/ipfs/QmTbFya18786ckJfLYUoWau9jBTKfmWnWm5XSViWvB7PXN"
			]
		},
		"https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/math/SafeMath.sol": {
			"keccak256": "0x2526b7c6a366fc211bbc176078ab02b83833e7682abcc5b3bed9d700b34e2a3e",
			"license": "MIT",
			"urls": [
				"bzz-raw://5f9529d3d365e8415155cee11394e0f7c0de2152b601b7e77508fce16cb4a509",
				"dweb:/ipfs/QmVhbcLVsAzvqfjsdLwy25XMjgVJm7Z3w2JCNiNbZF2GHT"
			]
		}
	},
	"version": 1
}

contracts...artifacts...GravityFinanceSale.json

// this line is added to create a gist. Empty file is not allowed.

contracts...artifacts...GravityFinanceSale_metadata.json

{
	"compiler": {
		"version": "0.8.3+commit.8d00100c"
	},
	"language": "Solidity",
	"output": {
		"abi": [
			{
				"inputs": [
					{
						"internalType": "uint256",
						"name": "GFIperETH",
						"type": "uint256"
					}
				],
				"stateMutability": "nonpayable",
				"type": "constructor"
			},
			{
				"anonymous": false,
				"inputs": [
					{
						"indexed": true,
						"internalType": "address",
						"name": "previousOwner",
						"type": "address"
					},
					{
						"indexed": true,
						"internalType": "address",
						"name": "newOwner",
						"type": "address"
					}
				],
				"name": "OwnershipTransferred",
				"type": "event"
			},
			{
				"anonymous": false,
				"inputs": [
					{
						"indexed": false,
						"internalType": "address",
						"name": "buyer",
						"type": "address"
					},
					{
						"indexed": false,
						"internalType": "uint256",
						"name": "amount",
						"type": "uint256"
					}
				],
				"name": "bought",
				"type": "event"
			},
			{
				"anonymous": false,
				"inputs": [
					{
						"indexed": false,
						"internalType": "uint256",
						"name": "oldPrice",
						"type": "uint256"
					},
					{
						"indexed": false,
						"internalType": "uint256",
						"name": "newPrice",
						"type": "uint256"
					}
				],
				"name": "priceAdjusted",
				"type": "event"
			},
			{
				"inputs": [],
				"name": "GFIPrice",
				"outputs": [
					{
						"internalType": "uint256",
						"name": "",
						"type": "uint256"
					}
				],
				"stateMutability": "view",
				"type": "function"
			},
			{
				"inputs": [
					{
						"internalType": "uint256",
						"name": "GFIperETH",
						"type": "uint256"
					}
				],
				"name": "adjustPrice",
				"outputs": [],
				"stateMutability": "nonpayable",
				"type": "function"
			},
			{
				"inputs": [],
				"name": "buy_GFI",
				"outputs": [
					{
						"internalType": "bool",
						"name": "success",
						"type": "bool"
					}
				],
				"stateMutability": "payable",
				"type": "function"
			},
			{
				"inputs": [
					{
						"internalType": "address payable",
						"name": "_address",
						"type": "address"
					}
				],
				"name": "endGFISeed",
				"outputs": [],
				"stateMutability": "nonpayable",
				"type": "function"
			},
			{
				"inputs": [],
				"name": "owner",
				"outputs": [
					{
						"internalType": "address",
						"name": "",
						"type": "address"
					}
				],
				"stateMutability": "view",
				"type": "function"
			},
			{
				"inputs": [],
				"name": "renounceOwnership",
				"outputs": [],
				"stateMutability": "nonpayable",
				"type": "function"
			},
			{
				"inputs": [
					{
						"internalType": "address",
						"name": "addr",
						"type": "address"
					}
				],
				"name": "set_token_contract",
				"outputs": [],
				"stateMutability": "nonpayable",
				"type": "function"
			},
			{
				"inputs": [],
				"name": "token_addr",
				"outputs": [
					{
						"internalType": "address",
						"name": "",
						"type": "address"
					}
				],
				"stateMutability": "view",
				"type": "function"
			},
			{
				"inputs": [
					{
						"internalType": "address",
						"name": "newOwner",
						"type": "address"
					}
				],
				"name": "transferOwnership",
				"outputs": [],
				"stateMutability": "nonpayable",
				"type": "function"
			},
			{
				"stateMutability": "payable",
				"type": "receive"
			}
		],
		"devdoc": {
			"kind": "dev",
			"methods": {
				"adjustPrice(uint256)": {
					"details": "Adjust the GFI token price",
					"params": {
						"GFIperETH": "the amount of GFI a user receives for 1 ETH"
					}
				},
				"buy_GFI()": {
					"details": "Buy GFI tokens directly from the contract"
				},
				"endGFISeed(address)": {
					"details": "End the GFI token distribution by sending all leftover tokens and ether to the contract owner"
				},
				"owner()": {
					"details": "Returns the address of the current owner."
				},
				"renounceOwnership()": {
					"details": "Leaves the contract without owner. It will not be possible to call `onlyOwner` functions anymore. Can only be called by the current owner. NOTE: Renouncing ownership will leave the contract without an owner, thereby removing any functionality that is only available to the owner."
				},
				"set_token_contract(address)": {
					"details": "Set GFI Token contract address",
					"params": {
						"addr": "Address of GFI Token contract"
					}
				},
				"transferOwnership(address)": {
					"details": "Transfers ownership of the contract to a new account (`newOwner`). Can only be called by the current owner."
				}
			},
			"version": 1
		},
		"userdoc": {
			"kind": "user",
			"methods": {},
			"version": 1
		}
	},
	"settings": {
		"compilationTarget": {
			"contracts/Gravity_Sale.sol": "GravityFinanceSale"
		},
		"evmVersion": "istanbul",
		"libraries": {},
		"metadata": {
			"bytecodeHash": "ipfs"
		},
		"optimizer": {
			"enabled": false,
			"runs": 200
		},
		"remappings": []
	},
	"sources": {
		"contracts/Gravity_Sale.sol": {
			"keccak256": "0x368d5ba582633d811efe8b95687f8610600be8270e25cba9d9512c468c613a9a",
			"license": "MIT",
			"urls": [
				"bzz-raw://e378d3a0a1957139a19151d86284f7ceb52fcf496d049057ce2588cdaefd3a53",
				"dweb:/ipfs/Qmc9tDecyQmYAFnWNkNWhpViYeCQH5DVwn24udZdCZAbFM"
			]
		},
		"https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/access/Ownable.sol": {
			"keccak256": "0x1cae4f85f114ff17b90414f5da67365b1d00337abb5bce9bf944eb78a2c0673c",
			"license": "MIT",
			"urls": [
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				"dweb:/ipfs/QmRD1rAZEqQ73C33cdA3QoUyBDMEWnNKNMc6PNkAZWHeQQ"
			]
		},
		"https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/Context.sol": {
			"keccak256": "0xf930d2df426bfcfc1f7415be724f04081c96f4fb9ec8d0e3a521c07692dface0",
			"license": "MIT",
			"urls": [
				"bzz-raw://fc2bfdea0d2562c76fb3c4cf70a86c6ba25c5a30e8f8515c95aafdf8383f8395",
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			]
		}
	},
	"version": 1
}

contracts...artifacts...GravityGovernance.json

// this line is added to create a gist. Empty file is not allowed.

contracts...artifacts...GravityGovernance_metadata.json

{
	"compiler": {
		"version": "0.8.3+commit.8d00100c"
	},
	"language": "Solidity",
	"output": {
		"abi": [
			{
				"inputs": [
					{
						"internalType": "address",
						"name": "_tokenAddress",
						"type": "address"
					}
				],
				"stateMutability": "nonpayable",
				"type": "constructor"
			},
			{
				"anonymous": false,
				"inputs": [
					{
						"indexed": true,
						"internalType": "address",
						"name": "previousOwner",
						"type": "address"
					},
					{
						"indexed": true,
						"internalType": "address",
						"name": "newOwner",
						"type": "address"
					}
				],
				"name": "OwnershipTransferred",
				"type": "event"
			},
			{
				"inputs": [],
				"name": "GFIAddress",
				"outputs": [
					{
						"internalType": "address",
						"name": "",
						"type": "address"
					}
				],
				"stateMutability": "view",
				"type": "function"
			},
			{
				"inputs": [
					{
						"internalType": "address",
						"name": "",
						"type": "address"
					}
				],
				"name": "feeLedger",
				"outputs": [
					{
						"internalType": "uint256",
						"name": "",
						"type": "uint256"
					}
				],
				"stateMutability": "view",
				"type": "function"
			},
			{
				"inputs": [],
				"name": "owner",
				"outputs": [
					{
						"internalType": "address",
						"name": "",
						"type": "address"
					}
				],
				"stateMutability": "view",
				"type": "function"
			},
			{
				"inputs": [],
				"name": "renounceOwnership",
				"outputs": [],
				"stateMutability": "nonpayable",
				"type": "function"
			},
			{
				"inputs": [
					{
						"internalType": "address",
						"name": "_address",
						"type": "address"
					}
				],
				"name": "setGFIAddress",
				"outputs": [],
				"stateMutability": "nonpayable",
				"type": "function"
			},
			{
				"inputs": [
					{
						"internalType": "address",
						"name": "sender",
						"type": "address"
					},
					{
						"internalType": "address",
						"name": "recipient",
						"type": "address"
					},
					{
						"internalType": "uint256",
						"name": "amount",
						"type": "uint256"
					}
				],
				"name": "transfer",
				"outputs": [
					{
						"internalType": "bool",
						"name": "",
						"type": "bool"
					}
				],
				"stateMutability": "nonpayable",
				"type": "function"
			},
			{
				"inputs": [
					{
						"internalType": "address",
						"name": "sender",
						"type": "address"
					},
					{
						"internalType": "address",
						"name": "recipient",
						"type": "address"
					},
					{
						"internalType": "uint256",
						"name": "amount",
						"type": "uint256"
					}
				],
				"name": "transferFrom",
				"outputs": [
					{
						"internalType": "bool",
						"name": "",
						"type": "bool"
					}
				],
				"stateMutability": "nonpayable",
				"type": "function"
			},
			{
				"inputs": [
					{
						"internalType": "address",
						"name": "newOwner",
						"type": "address"
					}
				],
				"name": "transferOwnership",
				"outputs": [],
				"stateMutability": "nonpayable",
				"type": "function"
			}
		],
		"devdoc": {
			"kind": "dev",
			"methods": {
				"owner()": {
					"details": "Returns the address of the current owner."
				},
				"renounceOwnership()": {
					"details": "Leaves the contract without owner. It will not be possible to call `onlyOwner` functions anymore. Can only be called by the current owner. NOTE: Renouncing ownership will leave the contract without an owner, thereby removing any functionality that is only available to the owner."
				},
				"transferOwnership(address)": {
					"details": "Transfers ownership of the contract to a new account (`newOwner`). Can only be called by the current owner."
				}
			},
			"version": 1
		},
		"userdoc": {
			"kind": "user",
			"methods": {},
			"version": 1
		}
	},
	"settings": {
		"compilationTarget": {
			"contracts/Gravity_Governance.sol": "GravityGovernance"
		},
		"evmVersion": "istanbul",
		"libraries": {},
		"metadata": {
			"bytecodeHash": "ipfs"
		},
		"optimizer": {
			"enabled": false,
			"runs": 200
		},
		"remappings": []
	},
	"sources": {
		"contracts/Gravity_Governance.sol": {
			"keccak256": "0x6de0bd070e933fa42995fe71e8e8def1bf19d61c6771fea706e6b073cab3b17d",
			"license": "MIT",
			"urls": [
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			"license": "MIT",
			"urls": [
				"bzz-raw://d5ff16b336ce8f906478d5f2eecc6435e00833bdc0b92f6b209cf9e92cb5b2b7",
				"dweb:/ipfs/QmRD1rAZEqQ73C33cdA3QoUyBDMEWnNKNMc6PNkAZWHeQQ"
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		"https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/Context.sol": {
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contracts...artifacts...GravityTokenV2.json

// this line is added to create a gist. Empty file is not allowed.

contracts...artifacts...GravityTokenV2_metadata.json

{
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				"inputs": [
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						"name": "_name",
						"type": "string"
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					{
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						"type": "string"
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				"stateMutability": "nonpayable",
				"type": "constructor"
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						"internalType": "address",
						"name": "owner",
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						"internalType": "address",
						"name": "spender",
						"type": "address"
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					{
						"indexed": false,
						"internalType": "uint256",
						"name": "value",
						"type": "uint256"
					}
				],
				"name": "Approval",
				"type": "event"
			},
			{
				"anonymous": false,
				"inputs": [
					{
						"indexed": true,
						"internalType": "address",
						"name": "previousOwner",
						"type": "address"
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					{
						"indexed": true,
						"internalType": "address",
						"name": "newOwner",
						"type": "address"
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				"name": "OwnershipTransferred",
				"type": "event"
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			{
				"anonymous": false,
				"inputs": [
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						"internalType": "address",
						"name": "from",
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					{
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					{
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						"name": "value",
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				"name": "Transfer",
				"type": "event"
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			{
				"inputs": [],
				"name": "GovernanceAddress",
				"outputs": [
					{
						"internalType": "address",
						"name": "",
						"type": "address"
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				"stateMutability": "view",
				"type": "function"
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				"inputs": [],
				"name": "GovernanceContract",
				"outputs": [
					{
						"internalType": "contract iGovernanceContract",
						"name": "",
						"type": "address"
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				"stateMutability": "view",
				"type": "function"
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			{
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						"name": "owner",
						"type": "address"
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					{
						"internalType": "address",
						"name": "spender",
						"type": "address"
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				"name": "allowance",
				"outputs": [
					{
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						"name": "",
						"type": "uint256"
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				"stateMutability": "view",
				"type": "function"
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			{
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						"name": "spender",
						"type": "address"
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					{
						"internalType": "uint256",
						"name": "amount",
						"type": "uint256"
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				"name": "approve",
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						"name": "",
						"type": "bool"
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				"stateMutability": "nonpayable",
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						"name": "account",
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				"name": "balanceOf",
				"outputs": [
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						"name": "",
						"type": "uint256"
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				],
				"stateMutability": "view",
				"type": "function"
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				"name": "decimals",
				"outputs": [
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						"name": "",
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				"stateMutability": "view",
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				"stateMutability": "nonpayable",
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				"outputs": [
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				"type": "function"
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						"type": "bool"
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					{
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						"name": "",
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					"details": "See {IERC20-allowance}."
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					"details": "See {IERC20-approve}. Requirements: - `spender` cannot be the zero address."
				},
				"balanceOf(address)": {
					"details": "See {IERC20-balanceOf}."
				},
				"decimals()": {
					"details": "Returns the number of decimals used to get its user representation. For example, if `decimals` equals `2`, a balance of `505` tokens should be displayed to a user as `5,05` (`505 / 10 ** 2`). Tokens usually opt for a value of 18, imitating the relationship between Ether and Wei. This is the value {ERC20} uses, unless this function is overridden; NOTE: This information is only used for _display_ purposes: it in no way affects any of the arithmetic of the contract, including {IERC20-balanceOf} and {IERC20-transfer}."
				},
				"decreaseAllowance(address,uint256)": {
					"details": "Atomically decreases the allowance granted to `spender` by the caller. This is an alternative to {approve} that can be used as a mitigation for problems described in {IERC20-approve}. Emits an {Approval} event indicating the updated allowance. Requirements: - `spender` cannot be the zero address. - `spender` must have allowance for the caller of at least `subtractedValue`."
				},
				"increaseAllowance(address,uint256)": {
					"details": "Atomically increases the allowance granted to `spender` by the caller. This is an alternative to {approve} that can be used as a mitigation for problems described in {IERC20-approve}. Emits an {Approval} event indicating the updated allowance. Requirements: - `spender` cannot be the zero address."
				},
				"name()": {
					"details": "Returns the name of the token."
				},
				"owner()": {
					"details": "Returns the address of the current owner."
				},
				"renounceOwnership()": {
					"details": "Leaves the contract without owner. It will not be possible to call `onlyOwner` functions anymore. Can only be called by the current owner. NOTE: Renouncing ownership will leave the contract without an owner, thereby removing any functionality that is only available to the owner."
				},
				"symbol()": {
					"details": "Returns the symbol of the token, usually a shorter version of the name."
				},
				"totalSupply()": {
					"details": "See {IERC20-totalSupply}."
				},
				"transfer(address,uint256)": {
					"details": "See {IERC20-transfer}. Requirements: - `recipient` cannot be the zero address. - the caller must have a balance of at least `amount`."
				},
				"transferFrom(address,address,uint256)": {
					"details": "See {IERC20-transferFrom}. Emits an {Approval} event indicating the updated allowance. This is not required by the EIP. See the note at the beginning of {ERC20}. Requirements: - `sender` and `recipient` cannot be the zero address. - `sender` must have a balance of at least `amount`. - the caller must have allowance for ``sender``'s tokens of at least `amount`."
				},
				"transferOwnership(address)": {
					"details": "Transfers ownership of the contract to a new account (`newOwner`). Can only be called by the current owner."
				}
			},
			"version": 1
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			"version": 1
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contracts...artifacts...iGovernanceContract.json

{
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			"autoDeployLib": true
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			"autoDeployLib": true
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			"autoDeployLib": true
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			"opcodes": "",
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		},
		"gasEstimates": null,
		"methodIdentifiers": {
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			"transferFrom(address,address,uint256)": "23b872dd"
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				{
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				}
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				{
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			],
			"stateMutability": "nonpayable",
			"type": "function"
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	]
}

contracts...artifacts...iGovernanceContract_metadata.json

{
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				"stateMutability": "nonpayable",
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contracts...artifacts...iGravityToken.json

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contracts...artifacts...iGravityToken_metadata.json

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contracts...Gravity_Governance.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/access/Ownable.sol";

contract GravityGovernance is Ownable{
    
    address public GFIAddress;
    iGravityToken private GravityToken;
    mapping( address => uint) public feeLedger; //Keep track of how much fees someone has to claim.
    
    constructor(address _tokenAddress){
        GFIAddress = _tokenAddress;
        GravityToken = iGravityToken(GFIAddress);
    }
    
    function setGFIAddress(address _address) external onlyOwner{
        GFIAddress = _address;
        GravityToken = iGravityToken(GFIAddress);
    }
    
    function transfer(address sender, address recipient, uint256 amount) external returns (bool){
        require(GravityToken.transferFrom(sender, address(this), amount), "Governance transferFrom failed!");
        //call update function and update fee ledger
        feeLedger[sender] = 100;
        require(GravityToken.transfer(recipient, amount), "Governance transfer failed!");
        return true;
    }
    
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool){
        //call update function and update fee ledger
        feeLedger[sender] = 1;
        require(GravityToken.transferFrom(sender, recipient, amount), "Governance transferFrom failed!");
        return true;
    }
}

interface iGravityToken {
    function transfer(address recipient, uint256 amount) external returns (bool);
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
}

contracts...Gravity_Sale.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/access/Ownable.sol";

//@title Gravity Token contract interface
interface GFI_Token {                                     
    function balanceOf(address owner) external returns (uint256);
    function transfer(address to, uint256 amount) external returns (bool);
    function transferFrom(address _from, address _to, uint256 _value) external returns (bool success);
}


contract GravityFinanceSale is Ownable {
    uint256 public GFIPrice ;
    
    address public token_addr ; 
    GFI_Token token_contract = GFI_Token(token_addr) ;
    
    event bought(address buyer, uint256 amount) ;
    event priceAdjusted(uint256 oldPrice, uint256 newPrice) ; 

    constructor(uint256 GFIperETH) {
        GFIPrice = GFIperETH ; 
    }

    /**
     * @dev Multiply two integers with extra checking the result
     * @param   a Integer 1 
     *          b Integer 2
     */
    function safeMultiply(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) {
            return 0 ;
        } else {
            uint256 c = a * b ;
            assert(c / a == b) ;
            return c ;
        }
    }
    
    /**
     * @dev Divide two integers with checking b is positive
     * @param   a Integer 1 
     *          b Integer 2
     */
    function safeDivide(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0); 
        uint256 c = a / b;

        return c;
    }
    
    /**
     * @dev Set GFI Token contract address
     * @param addr Address of GFI Token contract
     */
    function set_token_contract(address addr) external onlyOwner {
        token_addr = addr ;
        token_contract = GFI_Token(token_addr) ;
    }

    /**
     * @dev Buy GFI tokens directly from the contract
     */
    function buy_GFI() public payable returns (bool success) {
        uint256 scaledAmount = safeMultiply(msg.value, GFIPrice) ;
        require(token_contract.balanceOf(address(this)) >= scaledAmount) ;

        token_contract.transfer(msg.sender, scaledAmount) ;
        
        emit bought(msg.sender, scaledAmount) ; 
    
        return true ; 
    }
    
    /**
     * @dev Fallback function for when a user sends ether to the contract
     * directly instead of calling the function
     */
    receive() external payable {
        buy_GFI() ; 
    }

    /**
     * @dev Adjust the GFI token price
     * @param   GFIperETH the amount of GFI a user receives for 1 ETH
     */
    function adjustPrice(uint GFIperETH) external onlyOwner {
        emit priceAdjusted(GFIPrice, GFIperETH) ; 
        
        GFIPrice = GFIperETH ; 
        
    }

    /**
     * @dev End the GFI token distribution by sending all leftover tokens and ether to the contract owner
     */
    function endGFISeed(address payable _address) external onlyOwner {             
        require(token_contract.transfer(owner(), token_contract.balanceOf(address(this)))) ;

        _address.transfer(address(this).balance) ;
    }
}

contracts...Gravity_Token.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/Context.sol";
import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC20/IERC20.sol";
import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/math/SafeMath.sol";
import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/Address.sol";
import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/access/Ownable.sol";


//@title PRDX Token core contract
//@author Predix Network Team
contract GravityFinance is Context, IERC20, Ownable {
    using SafeMath for uint256;
    using Address for address;

    mapping (address => uint256) private _balances;

    mapping (address => mapping (address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;
    uint8 private _decimals;
    
    //contract addresses
    address public staking_addr ; 
    address public prediction_addr ;
    address public tokendistr_addr ; 
    
    uint public tokenCount;
    
    struct Token {
        uint tokenID;
        IERC20 tokenAddress;
        string tokenName;
        bool isValidToken;
        uint8 decimals;
    }
    
    mapping(uint => Token) public TokenInfo;

    uint256 public scaling = uint256(10) ** 18;
    uint256 public scaledRemainder = 0;

    mapping(address => uint256) public scaledDividendBalanceOf;
    uint256 public scaledDividendPerToken;
    mapping(address => uint256) public scaledDividendCreditedTo;    

    event AddNewToken(uint tokenID, IERC20 tokenAddress, string tokenName);
    event EthDividendWithdraw(uint amount);


    /**
     * @dev Sets the values for {name} and {symbol}, initializes {decimals} with
     * a default value of 18.
     *
     * To select a different value for {decimals}, use {_setupDecimals}.
     *
     * All three of these values are immutable: they can only be set once during
     * construction.
     */
    constructor () {
        _name = "Gravity Finance";
        _symbol = "GFI";
        _decimals = 18;
        _mint(msg.sender, 100 * 1e6 * 10**_decimals); 
    }
    
    receive() external payable {
        // scale the deposit and add the previous remainder
        uint256 available = (msg.value * scaling) + scaledRemainder;

        scaledDividendPerToken += available / _totalSupply;

        // compute the new remainder
        scaledRemainder = available % _totalSupply;
    }

    function withdrawEthDividends( address payable _address) external {
        update(msg.sender);
        uint256 amount = scaledDividendBalanceOf[msg.sender] / scaling;
        scaledDividendBalanceOf[msg.sender] %= scaling;
        // retain the remainder
        _address.transfer(amount);

        emit EthDividendWithdraw(amount);
    }
    
    function withdrawAndBurn(uint amount) external {
        uint balanceOfCaller = balanceOf(msg.sender);

        require(balanceOfCaller > 0, "Insufficient GFI balance");
        require(amount <= balanceOfCaller, "Amount exceeds GFI balance");

        uint userPercentage = amount.mul(100).div(_totalSupply / 1e18);

        for (uint256 i = 0; i < tokenCount; i++) {
            if (TokenInfo[i].decimals == 8) {
                TokenInfo[i].tokenAddress.transfer(msg.sender, SafeMath.div(SafeMath.mul(TokenInfo[i].tokenAddress.balanceOf(address(this)), (userPercentage / 10 ** 10)), 10000000000));
            } else if (TokenInfo[i].decimals == 18) {
                TokenInfo[i].tokenAddress.transfer(msg.sender, SafeMath.div(SafeMath.mul(TokenInfo[i].tokenAddress.balanceOf(address(this)), (userPercentage)), 100000000000000000000));
            } else if (TokenInfo[i].decimals == 6) {
                TokenInfo[i].tokenAddress.transfer(msg.sender, SafeMath.div(SafeMath.mul(TokenInfo[i].tokenAddress.balanceOf(address(this)), (userPercentage / 10 ** 12)), 100000000));
            }
        }

        _burn(amount);

    }
    
    function update(address account) internal {
        uint256 owed = scaledDividendPerToken - scaledDividendCreditedTo[account];
        scaledDividendBalanceOf[account] += balanceOf(account) * owed;
        scaledDividendCreditedTo[account] = scaledDividendPerToken;
    }
    
    function addNewToken(string memory _tokenName, IERC20 _newTokenAddress, uint8 _dec) external onlyOwner returns (bool success) {
        require(!TokenInfo[tokenCount].isValidToken);

        TokenInfo[tokenCount].tokenID = tokenCount;
        TokenInfo[tokenCount].tokenAddress = _newTokenAddress;
        TokenInfo[tokenCount].tokenName = _tokenName;
        TokenInfo[tokenCount].isValidToken = true;
        TokenInfo[tokenCount].decimals = _dec;

        emit AddNewToken(TokenInfo[tokenCount].tokenID, TokenInfo[tokenCount].tokenAddress, TokenInfo[tokenCount].tokenName);
        tokenCount++;

        return true;
    }
    
    /**
     * @dev Returns the name of the token.
     */
    function name() public view returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5,05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is
     * called.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view returns (uint8) {
        return _decimals;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20};
     *
     * Requirements:
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount));
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue));
        return true;
    }

    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * This is internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(address sender, address recipient, uint256 amount) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");
        
        //update sender & recipient for withdrawals
        update(sender);
        update(recipient);

        _balances[sender] = _balances[sender].sub(amount);
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements
     *
     * - `to` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(uint256 amount) public {
        require(msg.sender != address(0), "ERC20: burn from the zero address");

        _balances[msg.sender] = _balances[msg.sender].sub(amount);
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(msg.sender, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner`s tokens.
     *
     * This is internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 amount) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }
}

contracts...Gravity_TokenV2.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC20/ERC20.sol";
import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/access/Ownable.sol";

contract GravityTokenV2 is ERC20, Ownable {
    
    address public GovernanceAddress;
    iGovernanceContract public GovernanceContract;
    
    constructor(string memory _name, string memory _symbol, uint _supply) ERC20(_name, _symbol) {
        _mint(msg.sender, _supply);
    }

    function transfer(address recipient, uint256 amount) public override returns (bool) {
        if ( msg.sender == GovernanceAddress ){
            _transfer(_msgSender(), recipient, amount);
            return true;
        }
        else{
            require(GovernanceContract.transfer(msg.sender, recipient, amount), "Governance transferFrom failed!");
            return true;
        }
    }
    

    function transferFrom(address sender, address recipient, uint256 amount) public override returns (bool) {
        if ( msg.sender == GovernanceAddress ){
            _transfer(sender, recipient, amount);
    
            //uint256 currentAllowance = _allowances[sender][_msgSender()];
            uint256 currentAllowance = allowance(sender, _msgSender());
            require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
            _approve(sender, _msgSender(), currentAllowance - amount);
    
            return true;
        }
        else {
            require(GovernanceContract.transferFrom(sender, recipient, amount), "Governance transferFrom failed!");
            return true;
        }
    }
    
    
    function setGoverenanceContract(address _address) external onlyOwner{
        GovernanceAddress = _address;
        GovernanceContract = iGovernanceContract(GovernanceAddress); // Update contract
    }
    
}

interface iGovernanceContract{
    function transfer(address sender, address recipient, uint256 amount) external returns (bool);
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
}

scripts...deploy_ethers.js

// Right click on the script name and hit "Run" to execute
(async () => {
    try {
        console.log('Running deployWithEthers script...')
    
        const contractName = 'Storage' // Change this for other contract
        const constructorArgs = []    // Put constructor args (if any) here for your contract

        // Note that the script needs the ABI which is generated from the compilation artifact.
        // Make sure contract is compiled and artifacts are generated
        const artifactsPath = `browser/contracts/artifacts/${contractName}.json` // Change this for different path
    
        const metadata = JSON.parse(await remix.call('fileManager', 'getFile', artifactsPath))
        // 'web3Provider' is a remix global variable object
        const signer = (new ethers.providers.Web3Provider(web3Provider)).getSigner()
    
        let factory = new ethers.ContractFactory(metadata.abi, metadata.data.bytecode.object, signer);
    
        let contract = await factory.deploy(...constructorArgs);
    
        console.log('Contract Address: ', contract.address);
    
        // The contract is NOT deployed yet; we must wait until it is mined
        await contract.deployed()
        console.log('Deployment successful.')
    } catch (e) {
        console.log(e.message)
    }
})()

scripts...deploy_web3.js

// Right click on the script name and hit "Run" to execute
(async () => {
    try {
        console.log('Running deployWithWeb3 script...')
        
        const contractName = 'Storage' // Change this for other contract
        const constructorArgs = []    // Put constructor args (if any) here for your contract
    
        // Note that the script needs the ABI which is generated from the compilation artifact.
        // Make sure contract is compiled and artifacts are generated
        const artifactsPath = `browser/contracts/artifacts/${contractName}.json` // Change this for different path

        const metadata = JSON.parse(await remix.call('fileManager', 'getFile', artifactsPath))
        const accounts = await web3.eth.getAccounts()
    
        let contract = new web3.eth.Contract(metadata.abi)
    
        contract = contract.deploy({
            data: metadata.data.bytecode.object,
            arguments: constructorArgs
        })
    
        const newContractInstance = await contract.send({
            from: accounts[0],
            gas: 1500000,
            gasPrice: '30000000000'
        })
        console.log('Contract deployed at address: ', newContractInstance.options.address)
    } catch (e) {
        console.log(e.message)
    }
  })()

tests...4_Ballot_test.sol

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.7.0 <0.9.0;
import "remix_tests.sol"; // this import is automatically injected by Remix.
import "../contracts/3_Ballot.sol";

contract BallotTest {
   
    bytes32[] proposalNames;
   
    Ballot ballotToTest;
    function beforeAll () public {
        proposalNames.push(bytes32("candidate1"));
        ballotToTest = new Ballot(proposalNames);
    }
    
    function checkWinningProposal () public {
        ballotToTest.vote(0);
        Assert.equal(ballotToTest.winningProposal(), uint(0), "proposal at index 0 should be the winning proposal");
        Assert.equal(ballotToTest.winnerName(), bytes32("candidate1"), "candidate1 should be the winner name");
    }
    
    function checkWinninProposalWithReturnValue () public view returns (bool) {
        return ballotToTest.winningProposal() == 0;
    }
}