AE-0h/Address.sol

## Address.sol
/*

 ██████  ██████   ██████  ██   ██ ██████   ██████   ██████  ██   ██    ██████  ███████ ██    ██
██      ██    ██ ██    ██ ██  ██  ██   ██ ██    ██ ██    ██ ██  ██     ██   ██ ██      ██    ██
██      ██    ██ ██    ██ █████   ██████  ██    ██ ██    ██ █████      ██   ██ █████   ██    ██
██      ██    ██ ██    ██ ██  ██  ██   ██ ██    ██ ██    ██ ██  ██     ██   ██ ██       ██  ██
 ██████  ██████   ██████  ██   ██ ██████   ██████   ██████  ██   ██ ██ ██████  ███████   ████

Find any smart contract, and build your project faster: https://www.cookbook.dev
Twitter: https://twitter.com/cookbook_dev
Discord: https://discord.gg/WzsfPcfHrk

Find this contract on Cookbook: https://www.cookbook.dev/contracts/6-thunder-loan-audit-AssetToken/?utm=code
*/

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (utils/Address.sol)

pragma solidity ^0.8.20;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev The ETH balance of the account is not enough to perform the operation.
     */
    error AddressInsufficientBalance(address account);

    /**
     * @dev There's no code at `target` (it is not a contract).
     */
    error AddressEmptyCode(address target);

    /**
     * @dev A call to an address target failed. The target may have reverted.
     */
    error FailedInnerCall();

    /**
     * @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://consensys.net/diligence/blog/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/v0.8.20/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        if (address(this).balance < amount) {
            revert AddressInsufficientBalance(address(this));
        }

        (bool success, ) = recipient.call{value: amount}("");
        if (!success) {
            revert FailedInnerCall();
        }
    }

    /**
     * @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 or custom error, it is bubbled
     * up by this function (like regular Solidity function calls). However, if
     * the call reverted with no returned reason, this function reverts with a
     * {FailedInnerCall} error.
     *
     * 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.
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0);
    }

    /**
     * @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`.
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        if (address(this).balance < value) {
            revert AddressInsufficientBalance(address(this));
        }
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and reverts if the target
     * was not a contract or bubbling up the revert reason (falling back to {FailedInnerCall}) in case of an
     * unsuccessful call.
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata
    ) internal view returns (bytes memory) {
        if (!success) {
            _revert(returndata);
        } else {
            // only check if target is a contract if the call was successful and the return data is empty
            // otherwise we already know that it was a contract
            if (returndata.length == 0 && target.code.length == 0) {
                revert AddressEmptyCode(target);
            }
            return returndata;
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and reverts if it wasn't, either by bubbling the
     * revert reason or with a default {FailedInnerCall} error.
     */
    function verifyCallResult(bool success, bytes memory returndata) internal pure returns (bytes memory) {
        if (!success) {
            _revert(returndata);
        } else {
            return returndata;
        }
    }

    /**
     * @dev Reverts with returndata if present. Otherwise reverts with {FailedInnerCall}.
     */
    function _revert(bytes memory returndata) private pure {
        // 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
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert FailedInnerCall();
        }
    }
}

## AssetToken.sol
/*

 ██████  ██████   ██████  ██   ██ ██████   ██████   ██████  ██   ██    ██████  ███████ ██    ██
██      ██    ██ ██    ██ ██  ██  ██   ██ ██    ██ ██    ██ ██  ██     ██   ██ ██      ██    ██
██      ██    ██ ██    ██ █████   ██████  ██    ██ ██    ██ █████      ██   ██ █████   ██    ██
██      ██    ██ ██    ██ ██  ██  ██   ██ ██    ██ ██    ██ ██  ██     ██   ██ ██       ██  ██
 ██████  ██████   ██████  ██   ██ ██████   ██████   ██████  ██   ██ ██ ██████  ███████   ████

Find any smart contract, and build your project faster: https://www.cookbook.dev
Twitter: https://twitter.com/cookbook_dev
Discord: https://discord.gg/WzsfPcfHrk

Find this contract on Cookbook: https://www.cookbook.dev/contracts/6-thunder-loan-audit-AssetToken/?utm=code
*/

// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity 0.8.20;

import { ERC20 } from "./ERC20.sol";
import { IERC20 } from "./IERC20.sol";
import { SafeERC20 } from "./SafeERC20.sol";

contract AssetToken is ERC20 {
    error AssetToken__onlyThunderLoan();
    error AssetToken__ExhangeRateCanOnlyIncrease(uint256 oldExchangeRate, uint256 newExchangeRate);
    error AssetToken__ZeroAddress();

    using SafeERC20 for IERC20;

    /*//////////////////////////////////////////////////////////////
                            STATE VARIABLES
    //////////////////////////////////////////////////////////////*/
    IERC20 private immutable i_underlying;
    address private immutable i_thunderLoan;

    // The underlying per asset exchange rate
    // ie: s_exchangeRate = 2
    // means 1 asset token is worth 2 underlying tokens
    uint256 private s_exchangeRate;
    uint256 public constant EXCHANGE_RATE_PRECISION = 1e18;
    uint256 private constant STARTING_EXCHANGE_RATE = 1e18;

    /*//////////////////////////////////////////////////////////////
                                 EVENTS
    //////////////////////////////////////////////////////////////*/
    event ExchangeRateUpdated(uint256 newExchangeRate);

    /*//////////////////////////////////////////////////////////////
                               MODIFIERS
    //////////////////////////////////////////////////////////////*/
    modifier onlyThunderLoan() {
        if (msg.sender != i_thunderLoan) {
            revert AssetToken__onlyThunderLoan();
        }
        _;
    }

    modifier revertIfZeroAddress(address someAddress) {
        if (someAddress == address(0)) {
            revert AssetToken__ZeroAddress();
        }
        _;
    }

    /*//////////////////////////////////////////////////////////////
                               FUNCTIONS
    //////////////////////////////////////////////////////////////*/
    constructor(
        address thunderLoan,
        IERC20 underlying,
        string memory assetName,
        string memory assetSymbol
    )
        ERC20(assetName, assetSymbol)
        revertIfZeroAddress(thunderLoan)
        revertIfZeroAddress(address(underlying))
    {
        i_thunderLoan = thunderLoan;
        i_underlying = underlying;
        s_exchangeRate = STARTING_EXCHANGE_RATE;
    }

    function mint(address to, uint256 amount) external onlyThunderLoan {
        _mint(to, amount);
    }

    function burn(address account, uint256 amount) external onlyThunderLoan {
        _burn(account, amount);
    }

    function transferUnderlyingTo(address to, uint256 amount) external onlyThunderLoan {
        i_underlying.safeTransfer(to, amount);
    }

    function updateExchangeRate(uint256 fee) external onlyThunderLoan {
        // 1. Get the current exchange rate
        // 2. How big the fee is should be divided by the total supply
        // 3. So if the fee is 1e18, and the total supply is 2e18, the exchange rate be multiplied by 1.5
        // if the fee is 0.5 ETH, and the total supply is 4, the exchange rate should be multiplied by 1.125
        // it should always go up, never down
        // newExchangeRate = oldExchangeRate * (totalSupply + fee) / totalSupply
        // newExchangeRate = 1 (4 + 0.5) / 4
        // newExchangeRate = 1.125
        uint256 newExchangeRate = s_exchangeRate * (totalSupply() + fee) / totalSupply();

        if (newExchangeRate <= s_exchangeRate) {
            revert AssetToken__ExhangeRateCanOnlyIncrease(s_exchangeRate, newExchangeRate);
        }
        s_exchangeRate = newExchangeRate;
        emit ExchangeRateUpdated(s_exchangeRate);
    }

    function getExchangeRate() external view returns (uint256) {
        return s_exchangeRate;
    }

    function getUnderlying() external view returns (IERC20) {
        return i_underlying;
    }
}

## Context.sol
/*

 ██████  ██████   ██████  ██   ██ ██████   ██████   ██████  ██   ██    ██████  ███████ ██    ██
██      ██    ██ ██    ██ ██  ██  ██   ██ ██    ██ ██    ██ ██  ██     ██   ██ ██      ██    ██
██      ██    ██ ██    ██ █████   ██████  ██    ██ ██    ██ █████      ██   ██ █████   ██    ██
██      ██    ██ ██    ██ ██  ██  ██   ██ ██    ██ ██    ██ ██  ██     ██   ██ ██       ██  ██
 ██████  ██████   ██████  ██   ██ ██████   ██████   ██████  ██   ██ ██ ██████  ███████   ████

Find any smart contract, and build your project faster: https://www.cookbook.dev
Twitter: https://twitter.com/cookbook_dev
Discord: https://discord.gg/WzsfPcfHrk

Find this contract on Cookbook: https://www.cookbook.dev/contracts/6-thunder-loan-audit-AssetToken/?utm=code
*/

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (utils/Context.sol)

pragma solidity ^0.8.20;

/**
 * @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) {
        return msg.data;
    }
}

## draft-IERC6093.sol
/*

 ██████  ██████   ██████  ██   ██ ██████   ██████   ██████  ██   ██    ██████  ███████ ██    ██
██      ██    ██ ██    ██ ██  ██  ██   ██ ██    ██ ██    ██ ██  ██     ██   ██ ██      ██    ██
██      ██    ██ ██    ██ █████   ██████  ██    ██ ██    ██ █████      ██   ██ █████   ██    ██
██      ██    ██ ██    ██ ██  ██  ██   ██ ██    ██ ██    ██ ██  ██     ██   ██ ██       ██  ██
 ██████  ██████   ██████  ██   ██ ██████   ██████   ██████  ██   ██ ██ ██████  ███████   ████

Find any smart contract, and build your project faster: https://www.cookbook.dev
Twitter: https://twitter.com/cookbook_dev
Discord: https://discord.gg/WzsfPcfHrk

Find this contract on Cookbook: https://www.cookbook.dev/contracts/6-thunder-loan-audit-AssetToken/?utm=code
*/

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (interfaces/draft-IERC6093.sol)
pragma solidity ^0.8.20;

/**
 * @dev Standard ERC20 Errors
 * Interface of the https://eips.ethereum.org/EIPS/eip-6093[ERC-6093] custom errors for ERC20 tokens.
 */
interface IERC20Errors {
    /**
     * @dev Indicates an error related to the current `balance` of a `sender`. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     * @param balance Current balance for the interacting account.
     * @param needed Minimum amount required to perform a transfer.
     */
    error ERC20InsufficientBalance(address sender, uint256 balance, uint256 needed);

    /**
     * @dev Indicates a failure with the token `sender`. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     */
    error ERC20InvalidSender(address sender);

    /**
     * @dev Indicates a failure with the token `receiver`. Used in transfers.
     * @param receiver Address to which tokens are being transferred.
     */
    error ERC20InvalidReceiver(address receiver);

    /**
     * @dev Indicates a failure with the `spender`’s `allowance`. Used in transfers.
     * @param spender Address that may be allowed to operate on tokens without being their owner.
     * @param allowance Amount of tokens a `spender` is allowed to operate with.
     * @param needed Minimum amount required to perform a transfer.
     */
    error ERC20InsufficientAllowance(address spender, uint256 allowance, uint256 needed);

    /**
     * @dev Indicates a failure with the `approver` of a token to be approved. Used in approvals.
     * @param approver Address initiating an approval operation.
     */
    error ERC20InvalidApprover(address approver);

    /**
     * @dev Indicates a failure with the `spender` to be approved. Used in approvals.
     * @param spender Address that may be allowed to operate on tokens without being their owner.
     */
    error ERC20InvalidSpender(address spender);
}

/**
 * @dev Standard ERC721 Errors
 * Interface of the https://eips.ethereum.org/EIPS/eip-6093[ERC-6093] custom errors for ERC721 tokens.
 */
interface IERC721Errors {
    /**
     * @dev Indicates that an address can't be an owner. For example, `address(0)` is a forbidden owner in EIP-20.
     * Used in balance queries.
     * @param owner Address of the current owner of a token.
     */
    error ERC721InvalidOwner(address owner);

    /**
     * @dev Indicates a `tokenId` whose `owner` is the zero address.
     * @param tokenId Identifier number of a token.
     */
    error ERC721NonexistentToken(uint256 tokenId);

    /**
     * @dev Indicates an error related to the ownership over a particular token. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     * @param tokenId Identifier number of a token.
     * @param owner Address of the current owner of a token.
     */
    error ERC721IncorrectOwner(address sender, uint256 tokenId, address owner);

    /**
     * @dev Indicates a failure with the token `sender`. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     */
    error ERC721InvalidSender(address sender);

    /**
     * @dev Indicates a failure with the token `receiver`. Used in transfers.
     * @param receiver Address to which tokens are being transferred.
     */
    error ERC721InvalidReceiver(address receiver);

    /**
     * @dev Indicates a failure with the `operator`’s approval. Used in transfers.
     * @param operator Address that may be allowed to operate on tokens without being their owner.
     * @param tokenId Identifier number of a token.
     */
    error ERC721InsufficientApproval(address operator, uint256 tokenId);

    /**
     * @dev Indicates a failure with the `approver` of a token to be approved. Used in approvals.
     * @param approver Address initiating an approval operation.
     */
    error ERC721InvalidApprover(address approver);

    /**
     * @dev Indicates a failure with the `operator` to be approved. Used in approvals.
     * @param operator Address that may be allowed to operate on tokens without being their owner.
     */
    error ERC721InvalidOperator(address operator);
}

/**
 * @dev Standard ERC1155 Errors
 * Interface of the https://eips.ethereum.org/EIPS/eip-6093[ERC-6093] custom errors for ERC1155 tokens.
 */
interface IERC1155Errors {
    /**
     * @dev Indicates an error related to the current `balance` of a `sender`. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     * @param balance Current balance for the interacting account.
     * @param needed Minimum amount required to perform a transfer.
     * @param tokenId Identifier number of a token.
     */
    error ERC1155InsufficientBalance(address sender, uint256 balance, uint256 needed, uint256 tokenId);

    /**
     * @dev Indicates a failure with the token `sender`. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     */
    error ERC1155InvalidSender(address sender);

    /**
     * @dev Indicates a failure with the token `receiver`. Used in transfers.
     * @param receiver Address to which tokens are being transferred.
     */
    error ERC1155InvalidReceiver(address receiver);

    /**
     * @dev Indicates a failure with the `operator`’s approval. Used in transfers.
     * @param operator Address that may be allowed to operate on tokens without being their owner.
     * @param owner Address of the current owner of a token.
     */
    error ERC1155MissingApprovalForAll(address operator, address owner);

    /**
     * @dev Indicates a failure with the `approver` of a token to be approved. Used in approvals.
     * @param approver Address initiating an approval operation.
     */
    error ERC1155InvalidApprover(address approver);

    /**
     * @dev Indicates a failure with the `operator` to be approved. Used in approvals.
     * @param operator Address that may be allowed to operate on tokens without being their owner.
     */
    error ERC1155InvalidOperator(address operator);

    /**
     * @dev Indicates an array length mismatch between ids and values in a safeBatchTransferFrom operation.
     * Used in batch transfers.
     * @param idsLength Length of the array of token identifiers
     * @param valuesLength Length of the array of token amounts
     */
    error ERC1155InvalidArrayLength(uint256 idsLength, uint256 valuesLength);
}

## ERC20.sol
/*

 ██████  ██████   ██████  ██   ██ ██████   ██████   ██████  ██   ██    ██████  ███████ ██    ██
██      ██    ██ ██    ██ ██  ██  ██   ██ ██    ██ ██    ██ ██  ██     ██   ██ ██      ██    ██
██      ██    ██ ██    ██ █████   ██████  ██    ██ ██    ██ █████      ██   ██ █████   ██    ██
██      ██    ██ ██    ██ ██  ██  ██   ██ ██    ██ ██    ██ ██  ██     ██   ██ ██       ██  ██
 ██████  ██████   ██████  ██   ██ ██████   ██████   ██████  ██   ██ ██ ██████  ███████   ████

Find any smart contract, and build your project faster: https://www.cookbook.dev
Twitter: https://twitter.com/cookbook_dev
Discord: https://discord.gg/WzsfPcfHrk

Find this contract on Cookbook: https://www.cookbook.dev/contracts/6-thunder-loan-audit-AssetToken/?utm=code
*/

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/ERC20.sol)

pragma solidity ^0.8.20;

import {IERC20} from "./IERC20.sol";
import {IERC20Metadata} from "./IERC20Metadata.sol";
import {Context} from "./Context.sol";
import {IERC20Errors} from "./draft-IERC6093.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}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * The default value of {decimals} is 18. To change this, you should override
 * this function so it returns a different value.
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead 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.
 */
abstract contract ERC20 is Context, IERC20, IERC20Metadata, IERC20Errors {
    mapping(address account => uint256) private _balances;

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

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * 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 returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual 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 default value returned by this function, unless
     * it's 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 returns (uint8) {
        return 18;
    }

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

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

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

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

    /**
     * @dev See {IERC20-approve}.
     *
     * NOTE: If `value` is the maximum `uint256`, the allowance is not updated on
     * `transferFrom`. This is semantically equivalent to an infinite approval.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 value) public virtual returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, value);
        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}.
     *
     * NOTE: Does not update the allowance if the current allowance
     * is the maximum `uint256`.
     *
     * Requirements:
     *
     * - `from` and `to` cannot be the zero address.
     * - `from` must have a balance of at least `value`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `value`.
     */
    function transferFrom(address from, address to, uint256 value) public virtual returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, value);
        _transfer(from, to, value);
        return true;
    }

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to`.
     *
     * This internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * NOTE: This function is not virtual, {_update} should be overridden instead.
     */
    function _transfer(address from, address to, uint256 value) internal {
        if (from == address(0)) {
            revert ERC20InvalidSender(address(0));
        }
        if (to == address(0)) {
            revert ERC20InvalidReceiver(address(0));
        }
        _update(from, to, value);
    }

    /**
     * @dev Transfers a `value` amount of tokens from `from` to `to`, or alternatively mints (or burns) if `from`
     * (or `to`) is the zero address. All customizations to transfers, mints, and burns should be done by overriding
     * this function.
     *
     * Emits a {Transfer} event.
     */
    function _update(address from, address to, uint256 value) internal virtual {
        if (from == address(0)) {
            // Overflow check required: The rest of the code assumes that totalSupply never overflows
            _totalSupply += value;
        } else {
            uint256 fromBalance = _balances[from];
            if (fromBalance < value) {
                revert ERC20InsufficientBalance(from, fromBalance, value);
            }
            unchecked {
                // Overflow not possible: value <= fromBalance <= totalSupply.
                _balances[from] = fromBalance - value;
            }
        }

        if (to == address(0)) {
            unchecked {
                // Overflow not possible: value <= totalSupply or value <= fromBalance <= totalSupply.
                _totalSupply -= value;
            }
        } else {
            unchecked {
                // Overflow not possible: balance + value is at most totalSupply, which we know fits into a uint256.
                _balances[to] += value;
            }
        }

        emit Transfer(from, to, value);
    }

    /**
     * @dev Creates a `value` amount of tokens and assigns them to `account`, by transferring it from address(0).
     * Relies on the `_update` mechanism
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * NOTE: This function is not virtual, {_update} should be overridden instead.
     */
    function _mint(address account, uint256 value) internal {
        if (account == address(0)) {
            revert ERC20InvalidReceiver(address(0));
        }
        _update(address(0), account, value);
    }

    /**
     * @dev Destroys a `value` amount of tokens from `account`, lowering the total supply.
     * Relies on the `_update` mechanism.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * NOTE: This function is not virtual, {_update} should be overridden instead
     */
    function _burn(address account, uint256 value) internal {
        if (account == address(0)) {
            revert ERC20InvalidSender(address(0));
        }
        _update(account, address(0), value);
    }

    /**
     * @dev Sets `value` 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.
     *
     * Overrides to this logic should be done to the variant with an additional `bool emitEvent` argument.
     */
    function _approve(address owner, address spender, uint256 value) internal {
        _approve(owner, spender, value, true);
    }

    /**
     * @dev Variant of {_approve} with an optional flag to enable or disable the {Approval} event.
     *
     * By default (when calling {_approve}) the flag is set to true. On the other hand, approval changes made by
     * `_spendAllowance` during the `transferFrom` operation set the flag to false. This saves gas by not emitting any
     * `Approval` event during `transferFrom` operations.
     *
     * Anyone who wishes to continue emitting `Approval` events on the`transferFrom` operation can force the flag to
     * true using the following override:
     * ```
     * function _approve(address owner, address spender, uint256 value, bool) internal virtual override {
     *     super._approve(owner, spender, value, true);
     * }
     * ```
     *
     * Requirements are the same as {_approve}.
     */
    function _approve(address owner, address spender, uint256 value, bool emitEvent) internal virtual {
        if (owner == address(0)) {
            revert ERC20InvalidApprover(address(0));
        }
        if (spender == address(0)) {
            revert ERC20InvalidSpender(address(0));
        }
        _allowances[owner][spender] = value;
        if (emitEvent) {
            emit Approval(owner, spender, value);
        }
    }

    /**
     * @dev Updates `owner` s allowance for `spender` based on spent `value`.
     *
     * Does not update the allowance value in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Does not emit an {Approval} event.
     */
    function _spendAllowance(address owner, address spender, uint256 value) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            if (currentAllowance < value) {
                revert ERC20InsufficientAllowance(spender, currentAllowance, value);
            }
            unchecked {
                _approve(owner, spender, currentAllowance - value, false);
            }
        }
    }
}

## IERC20.sol
/*

 ██████  ██████   ██████  ██   ██ ██████   ██████   ██████  ██   ██    ██████  ███████ ██    ██
██      ██    ██ ██    ██ ██  ██  ██   ██ ██    ██ ██    ██ ██  ██     ██   ██ ██      ██    ██
██      ██    ██ ██    ██ █████   ██████  ██    ██ ██    ██ █████      ██   ██ █████   ██    ██
██      ██    ██ ██    ██ ██  ██  ██   ██ ██    ██ ██    ██ ██  ██     ██   ██ ██       ██  ██
 ██████  ██████   ██████  ██   ██ ██████   ██████   ██████  ██   ██ ██ ██████  ███████   ████

Find any smart contract, and build your project faster: https://www.cookbook.dev
Twitter: https://twitter.com/cookbook_dev
Discord: https://discord.gg/WzsfPcfHrk

Find this contract on Cookbook: https://www.cookbook.dev/contracts/6-thunder-loan-audit-AssetToken/?utm=code
*/

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.20;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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);

    /**
     * @dev Returns the value of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

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

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

## IERC20Metadata.sol
/*

 ██████  ██████   ██████  ██   ██ ██████   ██████   ██████  ██   ██    ██████  ███████ ██    ██
██      ██    ██ ██    ██ ██  ██  ██   ██ ██    ██ ██    ██ ██  ██     ██   ██ ██      ██    ██
██      ██    ██ ██    ██ █████   ██████  ██    ██ ██    ██ █████      ██   ██ █████   ██    ██
██      ██    ██ ██    ██ ██  ██  ██   ██ ██    ██ ██    ██ ██  ██     ██   ██ ██       ██  ██
 ██████  ██████   ██████  ██   ██ ██████   ██████   ██████  ██   ██ ██ ██████  ███████   ████

Find any smart contract, and build your project faster: https://www.cookbook.dev
Twitter: https://twitter.com/cookbook_dev
Discord: https://discord.gg/WzsfPcfHrk

Find this contract on Cookbook: https://www.cookbook.dev/contracts/6-thunder-loan-audit-AssetToken/?utm=code
*/

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.20;

import {IERC20} from "./IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 */
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);
}

## IERC20Permit.sol
/*

 ██████  ██████   ██████  ██   ██ ██████   ██████   ██████  ██   ██    ██████  ███████ ██    ██
██      ██    ██ ██    ██ ██  ██  ██   ██ ██    ██ ██    ██ ██  ██     ██   ██ ██      ██    ██
██      ██    ██ ██    ██ █████   ██████  ██    ██ ██    ██ █████      ██   ██ █████   ██    ██
██      ██    ██ ██    ██ ██  ██  ██   ██ ██    ██ ██    ██ ██  ██     ██   ██ ██       ██  ██
 ██████  ██████   ██████  ██   ██ ██████   ██████   ██████  ██   ██ ██ ██████  ███████   ████

Find any smart contract, and build your project faster: https://www.cookbook.dev
Twitter: https://twitter.com/cookbook_dev
Discord: https://discord.gg/WzsfPcfHrk

Find this contract on Cookbook: https://www.cookbook.dev/contracts/6-thunder-loan-audit-AssetToken/?utm=code
*/

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/extensions/IERC20Permit.sol)

pragma solidity ^0.8.20;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 *
 * ==== Security Considerations
 *
 * There are two important considerations concerning the use of `permit`. The first is that a valid permit signature
 * expresses an allowance, and it should not be assumed to convey additional meaning. In particular, it should not be
 * considered as an intention to spend the allowance in any specific way. The second is that because permits have
 * built-in replay protection and can be submitted by anyone, they can be frontrun. A protocol that uses permits should
 * take this into consideration and allow a `permit` call to fail. Combining these two aspects, a pattern that may be
 * generally recommended is:
 *
 * ```solidity
 * function doThingWithPermit(..., uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) public {
 *     try token.permit(msg.sender, address(this), value, deadline, v, r, s) {} catch {}
 *     doThing(..., value);
 * }
 *
 * function doThing(..., uint256 value) public {
 *     token.safeTransferFrom(msg.sender, address(this), value);
 *     ...
 * }
 * ```
 *
 * Observe that: 1) `msg.sender` is used as the owner, leaving no ambiguity as to the signer intent, and 2) the use of
 * `try/catch` allows the permit to fail and makes the code tolerant to frontrunning. (See also
 * {SafeERC20-safeTransferFrom}).
 *
 * Additionally, note that smart contract wallets (such as Argent or Safe) are not able to produce permit signatures, so
 * contracts should have entry points that don't rely on permit.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     *
     * CAUTION: See Security Considerations above.
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

## SafeERC20.sol
/*

 ██████  ██████   ██████  ██   ██ ██████   ██████   ██████  ██   ██    ██████  ███████ ██    ██
██      ██    ██ ██    ██ ██  ██  ██   ██ ██    ██ ██    ██ ██  ██     ██   ██ ██      ██    ██
██      ██    ██ ██    ██ █████   ██████  ██    ██ ██    ██ █████      ██   ██ █████   ██    ██
██      ██    ██ ██    ██ ██  ██  ██   ██ ██    ██ ██    ██ ██  ██     ██   ██ ██       ██  ██
 ██████  ██████   ██████  ██   ██ ██████   ██████   ██████  ██   ██ ██ ██████  ███████   ████

Find any smart contract, and build your project faster: https://www.cookbook.dev
Twitter: https://twitter.com/cookbook_dev
Discord: https://discord.gg/WzsfPcfHrk

Find this contract on Cookbook: https://www.cookbook.dev/contracts/6-thunder-loan-audit-AssetToken/?utm=code
*/

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.20;

import {IERC20} from "./IERC20.sol";
import {IERC20Permit} from "./IERC20Permit.sol";
import {Address} from "./Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    /**
     * @dev An operation with an ERC20 token failed.
     */
    error SafeERC20FailedOperation(address token);

    /**
     * @dev Indicates a failed `decreaseAllowance` request.
     */
    error SafeERC20FailedDecreaseAllowance(address spender, uint256 currentAllowance, uint256 requestedDecrease);

    /**
     * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeCall(token.transfer, (to, value)));
    }

    /**
     * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
     * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
     */
    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeCall(token.transferFrom, (from, to, value)));
    }

    /**
     * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        forceApprove(token, spender, oldAllowance + value);
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `requestedDecrease`. If `token` returns no
     * value, non-reverting calls are assumed to be successful.
     */
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 requestedDecrease) internal {
        unchecked {
            uint256 currentAllowance = token.allowance(address(this), spender);
            if (currentAllowance < requestedDecrease) {
                revert SafeERC20FailedDecreaseAllowance(spender, currentAllowance, requestedDecrease);
            }
            forceApprove(token, spender, currentAllowance - requestedDecrease);
        }
    }

    /**
     * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval
     * to be set to zero before setting it to a non-zero value, such as USDT.
     */
    function forceApprove(IERC20 token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeCall(token.approve, (spender, value));

        if (!_callOptionalReturnBool(token, approvalCall)) {
            _callOptionalReturn(token, abi.encodeCall(token.approve, (spender, 0)));
            _callOptionalReturn(token, approvalCall);
        }
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address-functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data);
        if (returndata.length != 0 && !abi.decode(returndata, (bool))) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     *
     * This is a variant of {_callOptionalReturn} that silents catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We cannot use {Address-functionCall} here since this should return false
        // and not revert is the subcall reverts.

        (bool success, bytes memory returndata) = address(token).call(data);
        return success && (returndata.length == 0 || abi.decode(returndata, (bool))) && address(token).code.length > 0;
    }
}
	/*

	██████ ██████ ██████ ██ ██ ██████ ██████ ██████ ██ ██ ██████ ███████ ██ ██
	██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██
	██ ██ ██ ██ ██ █████ ██████ ██ ██ ██ ██ █████ ██ ██ █████ ██ ██
	██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██
	██████ ██████ ██████ ██ ██ ██████ ██████ ██████ ██ ██ ██ ██████ ███████ ████

	Find any smart contract, and build your project faster: https://www.cookbook.dev
	Twitter: https://twitter.com/cookbook_dev
	Discord: https://discord.gg/WzsfPcfHrk

	Find this contract on Cookbook: https://www.cookbook.dev/contracts/6-thunder-loan-audit-AssetToken/?utm=code
	*/

	// SPDX-License-Identifier: MIT
	// OpenZeppelin Contracts (last updated v5.0.0) (utils/Address.sol)

	pragma solidity ^0.8.20;

	/**
	* @dev Collection of functions related to the address type
	*/
	library Address {
	/**
	* @dev The ETH balance of the account is not enough to perform the operation.
	*/
	error AddressInsufficientBalance(address account);

	/**
	* @dev There's no code at `target` (it is not a contract).
	*/
	error AddressEmptyCode(address target);

	/**
	* @dev A call to an address target failed. The target may have reverted.
	*/
	error FailedInnerCall();

	/**
	* @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://consensys.net/diligence/blog/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/v0.8.20/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
	*/
	function sendValue(address payable recipient, uint256 amount) internal {
	if (address(this).balance < amount) {
	revert AddressInsufficientBalance(address(this));
	}

	(bool success, ) = recipient.call{value: amount}("");
	if (!success) {
	revert FailedInnerCall();
	}
	}

	/**
	* @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 or custom error, it is bubbled
	* up by this function (like regular Solidity function calls). However, if
	* the call reverted with no returned reason, this function reverts with a
	* {FailedInnerCall} error.
	*
	* 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.
	*/
	function functionCall(address target, bytes memory data) internal returns (bytes memory) {
	return functionCallWithValue(target, data, 0);
	}

	/**
	* @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`.
	*/
	function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
	if (address(this).balance < value) {
	revert AddressInsufficientBalance(address(this));
	}
	(bool success, bytes memory returndata) = target.call{value: value}(data);
	return verifyCallResultFromTarget(target, success, returndata);
	}

	/**
	* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
	* but performing a static call.
	*/
	function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
	(bool success, bytes memory returndata) = target.staticcall(data);
	return verifyCallResultFromTarget(target, success, returndata);
	}

	/**
	* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
	* but performing a delegate call.
	*/
	function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
	(bool success, bytes memory returndata) = target.delegatecall(data);
	return verifyCallResultFromTarget(target, success, returndata);
	}

	/**
	* @dev Tool to verify that a low level call to smart-contract was successful, and reverts if the target
	* was not a contract or bubbling up the revert reason (falling back to {FailedInnerCall}) in case of an
	* unsuccessful call.
	*/
	function verifyCallResultFromTarget(
	address target,
	bool success,
	bytes memory returndata
	) internal view returns (bytes memory) {
	if (!success) {
	_revert(returndata);
	} else {
	// only check if target is a contract if the call was successful and the return data is empty
	// otherwise we already know that it was a contract
	if (returndata.length == 0 && target.code.length == 0) {
	revert AddressEmptyCode(target);
	}
	return returndata;
	}
	}

	/**
	* @dev Tool to verify that a low level call was successful, and reverts if it wasn't, either by bubbling the
	* revert reason or with a default {FailedInnerCall} error.
	*/
	function verifyCallResult(bool success, bytes memory returndata) internal pure returns (bytes memory) {
	if (!success) {
	_revert(returndata);
	} else {
	return returndata;
	}
	}

	/**
	* @dev Reverts with returndata if present. Otherwise reverts with {FailedInnerCall}.
	*/
	function _revert(bytes memory returndata) private pure {
	// 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
	/// @solidity memory-safe-assembly
	assembly {
	let returndata_size := mload(returndata)
	revert(add(32, returndata), returndata_size)
	}
	} else {
	revert FailedInnerCall();
	}
	}
	}