Created using remix-ide: Realtime Ethereum Contract Compiler and Runtime. Load this file by pasting this gists URL or ID at https://remix.ethereum.org/#version=soljson-v0.6.6+commit.6c089d02.js&optimize=false&gist=

1_Storage.sol

pragma solidity >=0.4.22 <0.7.0;

/**
 * @title Storage
 * @dev Store & retreive value in a variable
 */
contract Storage {

    uint256 number;

    /**
     * @dev Store value in variable
     * @param num value to store
     */
    function store(uint256 num) public {
        number = num;
    }

    /**
     * @dev Return value 
     * @return value of 'number'
     */
    function retreive() public view returns (uint256){
        return number;
    }
}

2_Owner.sol

pragma solidity >=0.4.22 <0.7.0;

/**
 * @title Owner
 * @dev Set & change owner
 */
contract Owner {

    address private owner;
    
    // event for EVM logging
    event OwnerSet(address indexed oldOwner, address indexed newOwner);
    
    // modifier to check if caller is owner
    modifier isOwner() {
        // If the first argument of 'require' evaluates to 'false', execution terminates and all
        // changes to the state and to Ether balances are reverted.
        // This used to consume all gas in old EVM versions, but not anymore.
        // It is often a good idea to use 'require' to check if functions are called correctly.
        // As a second argument, you can also provide an explanation about what went wrong.
        require(msg.sender == owner, "Caller is not owner");
        _;
    }
    
    /**
     * @dev Set contract deployer as owner
     */
    constructor() public {
        owner = msg.sender; // 'msg.sender' is sender of current call, contract deployer for a constructor
        emit OwnerSet(address(0), owner);
    }

    /**
     * @dev Change owner
     * @param newOwner address of new owner
     */
    function changeOwner(address newOwner) public isOwner {
        emit OwnerSet(owner, newOwner);
        owner = newOwner;
    }

    /**
     * @dev Return owner address 
     * @return address of owner
     */
    function getOwner() external view returns (address) {
        return owner;
    }
}

3_Ballot.sol

pragma solidity >=0.4.22 <0.7.0;

/** 
 * @title Ballot
 * @dev Implements voting process along with vote delegation
 */
contract Ballot {
   
    struct Voter {
        uint weight; // weight is accumulated by delegation
        bool voted;  // if true, that person already voted
        address delegate; // person delegated to
        uint vote;   // index of the voted proposal
    }

    struct Proposal {
        // If you can limit the length to a certain number of bytes, 
        // always use one of bytes1 to bytes32 because they are much cheaper
        bytes32 name;   // short name (up to 32 bytes)
        uint voteCount; // number of accumulated votes
    }

    address public chairperson;

    mapping(address => Voter) public voters;

    Proposal[] public proposals;

    /** 
     * @dev Create a new ballot to choose one of 'proposalNames'.
     * @param proposalNames names of proposals
     */
    constructor(bytes32[] memory proposalNames) public {
        chairperson = msg.sender;
        voters[chairperson].weight = 1;

        for (uint i = 0; i < proposalNames.length; i++) {
            // 'Proposal({...})' creates a temporary
            // Proposal object and 'proposals.push(...)'
            // appends it to the end of 'proposals'.
            proposals.push(Proposal({
                name: proposalNames[i],
                voteCount: 0
            }));
        }
    }
    
    /** 
     * @dev Give 'voter' the right to vote on this ballot. May only be called by 'chairperson'.
     * @param voter address of voter
     */
    function giveRightToVote(address voter) public {
        require(
            msg.sender == chairperson,
            "Only chairperson can give right to vote."
        );
        require(
            !voters[voter].voted,
            "The voter already voted."
        );
        require(voters[voter].weight == 0);
        voters[voter].weight = 1;
    }

    /**
     * @dev Delegate your vote to the voter 'to'.
     * @param to address to which vote is delegated
     */
    function delegate(address to) public {
        Voter storage sender = voters[msg.sender];
        require(!sender.voted, "You already voted.");
        require(to != msg.sender, "Self-delegation is disallowed.");

        while (voters[to].delegate != address(0)) {
            to = voters[to].delegate;

            // We found a loop in the delegation, not allowed.
            require(to != msg.sender, "Found loop in delegation.");
        }
        sender.voted = true;
        sender.delegate = to;
        Voter storage delegate_ = voters[to];
        if (delegate_.voted) {
            // If the delegate already voted,
            // directly add to the number of votes
            proposals[delegate_.vote].voteCount += sender.weight;
        } else {
            // If the delegate did not vote yet,
            // add to her weight.
            delegate_.weight += sender.weight;
        }
    }

    /**
     * @dev Give your vote (including votes delegated to you) to proposal 'proposals[proposal].name'.
     * @param proposal index of proposal in the proposals array
     */
    function vote(uint proposal) public {
        Voter storage sender = voters[msg.sender];
        require(sender.weight != 0, "Has no right to vote");
        require(!sender.voted, "Already voted.");
        sender.voted = true;
        sender.vote = proposal;

        // If 'proposal' is out of the range of the array,
        // this will throw automatically and revert all
        // changes.
        proposals[proposal].voteCount += sender.weight;
    }

    /** 
     * @dev Computes the winning proposal taking all previous votes into account.
     * @return winningProposal_ index of winning proposal in the proposals array
     */
    function winningProposal() public view
            returns (uint winningProposal_)
    {
        uint winningVoteCount = 0;
        for (uint p = 0; p < proposals.length; p++) {
            if (proposals[p].voteCount > winningVoteCount) {
                winningVoteCount = proposals[p].voteCount;
                winningProposal_ = p;
            }
        }
    }

    /** 
     * @dev Calls winningProposal() function to get the index of the winner contained in the proposals array and then
     * @return winnerName_ the name of the winner
     */
    function winnerName() public view
            returns (bytes32 winnerName_)
    {
        winnerName_ = proposals[winningProposal()].name;
    }
}

erc.sol

pragma solidity 0.5.10;
/**
* TOKEN Contract
* ERC-20 Token Standard Compliant
*/

/**
 * @title SafeMath by OpenZeppelin
 * @dev Math operations with safety checks that throw on error
 */
library SafeMath {

    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        assert(b <= a);
        return a - b;
    }

    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        assert(c >= a);
        return c;
    }

}

/**
 * Token contract interface for external use
 */
contract ERC20TokenInterface {

    function balanceOf(address _owner) public view returns (uint256 value);
    function transfer(address _to, uint256 _value) public returns (bool success);
    function transferFrom(address _from, address _to, uint256 _value) public returns (bool success);
    function approve(address _spender, uint256 _value) public returns (bool success);
    function allowance(address _owner, address _spender) public view returns (uint256 remaining);
    
    event Approval(address,address,uint256);
    event Transfer(address,address,uint256);

    }

contract ApproveAndCallFallBack {

    function receiveApproval(address from, uint256 tokens, address token, bytes memory data) public;

}

/**
* @title Token definition
* @dev Define token paramters including ERC20 ones
*/
contract ERC20Token is ERC20TokenInterface { //Standard definition of a ERC20Token
    using SafeMath for uint256;
    uint256 public totalSupply;
    mapping (address => uint256) balances; //A mapping of all balances per address
    mapping (address => mapping (address => uint256)) allowed; //A mapping of all allowances

    /**
    * @dev Get the balance of an specified address.
    * @param _owner The address to be query.
    */
    function balanceOf(address _owner) public view returns (uint256 value) {
      return balances[_owner];
    }

    /**
    * @dev transfer token to a specified address
    * @param _to The address to transfer to.
    * @param _value The amount to be transferred.
    */
    function transfer(address _to, uint256 _value) public returns (bool success) {
        require(_to != address(0), '_to cannot be zero address'); //If you dont want that people destroy token
        balances[msg.sender] = balances[msg.sender].sub(_value);
        balances[_to] = balances[_to].add(_value);
        emit Transfer(msg.sender, _to, _value);
        return true;
    }

    /**
    * @dev transfer token from an address to another specified address using allowance
    * @param _from The address where token comes.
    * @param _to The address to transfer to.
    * @param _value The amount to be transferred.
    */
    function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) {
        require(_to != address(0), '_to cannot be zero address'); //If you dont want that people destroy token
        allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
        balances[_from] = balances[_from].sub(_value);
        balances[_to] = balances[_to].add(_value);
        emit Transfer(_from, _to, _value);
        return true;
    }

    /**
    * @dev Assign allowance to an specified address to use the owner balance
    * @param _spender The address to be allowed to spend.
    * @param _value The amount to be allowed.
    */
    function approve(address _spender, uint256 _value) public returns (bool success) {
        require((_value == 0) || (allowed[msg.sender][_spender] == 0));
        allowed[msg.sender][_spender] = _value;
        emit Approval(msg.sender, _spender, _value);
        return true;
    }

    /**
    * @dev Get the allowance of an specified address to use another address balance.
    * @param _owner The address of the owner of the tokens.
    * @param _spender The address of the allowed spender.
    */
    function allowance(address _owner, address _spender) public view returns (uint256 remaining) {
        return allowed[_owner][_spender];
    }

    function approveAndCall(address spender, uint256 _value, bytes memory data) public returns (bool success) {
        require((_value == 0) || (allowed[msg.sender][spender] == 0));
        allowed[msg.sender][spender] = _value;
}
}

ERC20.sol

pragma solidity ^0.6.0;

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 ERC20_token is ERC20,Ownable{

    uint256[6] prices = [1000,1500,2000,2500,3000,4000];
    uint256[6] timeLine = [1597190400,1598313600,1599696000,1600819200,1601856000,1602720000];
    
    // address owner;
    bool isIco;
    bool config;
    uint256 maxSupply;
    uint256 givenSupply;
    
    event Contribution(address from, uint256 amount);
    
    constructor(string memory _name, string memory _symbol,uint8 _decimal, uint256 _supply) ERC20(_name,_symbol) Ownable() public {
        _setupDecimals(_decimal);
        _mint(msg.sender,_supply* 10**uint256(_decimal));
        config = true;
        // owner = msg.sender;
        maxSupply = 10000000* 10**uint256(_decimal);
    }
    
    fallback () payable external {
        require(msg.value >= prices[0],"ERROR: invailed amount");
        require(isIco,"ERROR: ICO has  closed");
        uint256 price = getPrice();
        uint256 amount = msg.value * price;
        uint256 total = givenSupply + amount;
        require(total <= maxSupply,"ERROR: We are out of supply");
        maxSupply += amount;
        givenSupply += amount;
        _mint(msg.sender,amount);
        emit Contribution(msg.sender,amount);
        
    }
    
    function buyManually() payable public {
        require(msg.value >= prices[0],"ERROR: invailed amount");
        require(isIco,"ERROR: ICO has  closed");
        uint256 price = getPrice();
        uint256 amount = msg.value * price;
        uint256 total = givenSupply + amount;
        require(total <= maxSupply,"ERROR: We are t of supply");
        maxSupply += amount;
        givenSupply += amount;
        _mint(msg.sender,amount);
        emit Contribution(msg.sender,amount);
    }
    
    function startICO() public onlyOwner {
        // require(msg.sender  == owner,"ERROR: only owner can do this");
        require(config);
        isIco = true;
        config = false;      
    }
    
    function closeICO() public onlyOwner {
        // require(msg.sender  == owner,"ERROR: only owner can do this");
        isIco = false;
        payable(owner()).transfer(address(this).balance);
    }
   
    
    function getPrice() public view returns(uint256){
        for(uint8 i=0; i<=6; i++){
            if(now <= timeLine[i]){
                return prices[i];
            }
        }
    }
    
    // indexOFArray the palace of time with index if you want to change time of 12 august give 0 in 1 param and your time and soom
    function changeTimeLine(uint256 indexOFArray, uint256 _yourTimeinuinix) public onlyOwner {
        // require(msg.sender == owner, "ERROR only owner");
        timeLine[indexOFArray] = _yourTimeinuinix;
    }
    
    function changePrice(uint256 indexOFPriceArray, uint256 yourpice) public onlyOwner {
        // require(msg.sender == owner,"ERROR only owner");
        prices[indexOFPriceArray] = yourpice;
    }   
    
    function withdrwalEther() public onlyOwner {
        // require(msg.sender == owner,"ERROR: Your are not owner");
        payable(owner()).transfer(address(this).balance);
    }
    
    
}

expense_tracker.sol

pragma solidity ^0.6.0;

contract expenseTracker{
    
}

forena.sol

pragma solidity ^0.6.0;

contract forena{

    address public owner;
    uint256 public currentId;
    
    struct UserStruct{
        bool isExist;
        uint256 id;
        uint256 referrer_id;
    }   
    
    mapping(uint256 => address) userList;
    mapping(address => UserStruct) users;
    
    event userRegistered(address user,address referrer, uint256 slotamount);
    event flyBonus(address to, uint256 amount);
    
    constructor() public {
        owner = msg.sender;
        
        UserStruct memory userStruct;
        currentId++;
        
        userStruct = UserStruct({
            isExist: true,
            id: currentId,
            referrer_id: 0
        });
    }
    
    function buySlot(uint256 _referrerId) payable public {
        require(msg.value == 0.05 ether,"ERROR: slot price is 0.05 Ether");
        require(_referrerId > 0 && _referrerId <= currentId,"ERROR: invailed referrer id");
        require(msg.sender != address(0),"EEROR: ZERO ADDRESS");
        uint256 id;
        
        payable(owner).transfer(0.0065 ether);
        
        if(users[userList[_referrerId]].isExist == false){
            id = 1;
            payable(owner).transfer(0.01 ether);// referrer bonus if user dont have referre will go to owner
        }else{
            id = _referrerId;
            payable(userList[id]).transfer(0.01 ether);//referrer bonus 
        }
        
        
        UserStruct memory userStruct;
        currentId++;
        
        userStruct = UserStruct({
            isExist: true,
            id: currentId,
            referrer_id: id 
        });
        
        users[msg.sender] = userStruct;
        userList[currentId] = msg.sender;
        emit userRegistered(msg.sender, userList[id], msg.value);
        
        if(currentId > 4){
            distributeFlyBonus();
        }
    }
    
    function distributeFlyBonus() internal {
        uint256 id = currentId -3 ; 
        
        if(users[userList[id]].isExist){
            payable(userList[id]).transfer(0.1 ether);
        }
        emit flyBonus(userList[id], 0.1 ether);
    }
   
    
    function withdrwal() public {
        require(msg.sender == owner,"ERROr: only owner can do this");
        payable(owner).transfer(address(this).balance);
    }
    
}

ICO_TOKEN.sol

pragma solidity 0.4.19;

// ================= Ownable Contract start =============================
/*
 * Ownable
 *
 * Base contract with an owner.
 * Provides onlyOwner modifier, which prevents function from running if it is called by anyone other than the owner.
 */
contract Ownable {
  address public owner;

  function Ownable() public {
    owner = msg.sender;
  }

  modifier onlyOwner() {
    require(msg.sender == owner);
    _;
  }

  function transferOwnership(address newOwner) public onlyOwner {
    if (newOwner != address(0)) {
      owner = newOwner;
    }
  }
}
// ================= Ownable Contract end ===============================

// ================= Safemath Lib ============================
library SafeMath {

  /**
  * @dev Multiplies two numbers, throws on overflow.
  */
  function mul(uint256 a, uint256 b) internal pure returns (uint256) {
    if (a == 0) {
      return 0;
    }
    uint256 c = a * b;
    assert(c / a == b);
    return c;
  }

  /**
  * @dev Integer division of two numbers, truncating the quotient.
  */
  function div(uint256 a, uint256 b) internal pure returns (uint256) {
    // assert(b > 0); // Solidity automatically throws when dividing by 0
    uint256 c = a / b;
    // assert(a == b * c + a % b); // There is no case in which this doesn't hold
    return c;
  }

  /**
  * @dev Substracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend).
  */
  function sub(uint256 a, uint256 b) internal pure returns (uint256) {
    assert(b <= a);
    return a - b;
  }

  /**
  * @dev Adds two numbers, throws on overflow.
  */
  function add(uint256 a, uint256 b) internal pure returns (uint256) {
    uint256 c = a + b;
    assert(c >= a);
    return c;
  }
}
// ================= Safemath Lib end ==============================

// ================= ERC20 Token Contract start =========================
/*
 * ERC20 interface
 * see https://github.com/ethereum/EIPs/issues/20
 */
contract ERC20 {
  function totalSupply() public view returns (uint256);
  function balanceOf(address who) public view returns (uint256);
  function transfer(address to, uint256 value) public returns (bool);
  function allowance(address owner, address spender) public view returns (uint256);
  function transferFrom(address from, address to, uint256 value) public returns (bool);
  function approve(address spender, uint256 value) public returns (bool);
  event Transfer(address indexed from, address indexed to, uint256 value);
  event Approval(address indexed owner, address indexed spender, uint256 value);
}
// ================= ERC20 Token Contract end ===========================

// ================= Standard Token Contract start ======================
contract StandardToken is ERC20 {
  using SafeMath for uint256;

  mapping(address => uint256) balances;
  mapping (address => mapping (address => uint256)) internal allowed;

  uint256 totalSupply_;

  /**
  * @dev total number of tokens in existence
  */
  function totalSupply() public view returns (uint256) {
    return totalSupply_;
  }

  /**
  * @dev transfer token for a specified address
  * @param _to The address to transfer to.
  * @param _value The amount to be transferred.
  */
  function transfer(address _to, uint256 _value) public returns (bool) {
    require(_to != address(0));
    require(_value <= balances[msg.sender]);

    // SafeMath.sub will throw if there is not enough balance.
    balances[msg.sender] = balances[msg.sender].sub(_value);
    balances[_to] = balances[_to].add(_value);
    Transfer(msg.sender, _to, _value);
    return true;
  }

  /**
  * @dev Gets the balance of the specified address.
  * @param _owner The address to query the the balance of.
  * @return An uint256 representing the amount owned by the passed address.
  */
  function balanceOf(address _owner) public view returns (uint256 balance) {
    return balances[_owner];
  }


  /**
   * @dev Transfer tokens from one address to another
   * @param _from address The address which you want to send tokens from
   * @param _to address The address which you want to transfer to
   * @param _value uint256 the amount of tokens to be transferred
   */
  function transferFrom(address _from, address _to, uint256 _value) public returns (bool) {
    require(_to != address(0));
    require(_value <= balances[_from]);
    require(_value <= allowed[_from][msg.sender]);

    balances[_from] = balances[_from].sub(_value);
    balances[_to] = balances[_to].add(_value);
    allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
    Transfer(_from, _to, _value);
    return true;
  }

  /**
   * @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
   *
   * 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
   * @param _spender The address which will spend the funds.
   * @param _value The amount of tokens to be spent.
   */
  function approve(address _spender, uint256 _value) public returns (bool) {
    allowed[msg.sender][_spender] = _value;
    Approval(msg.sender, _spender, _value);
    return true;
  }

  /**
   * @dev Function to check the amount of tokens that an owner allowed to a spender.
   * @param _owner address The address which owns the funds.
   * @param _spender address The address which will spend the funds.
   * @return A uint256 specifying the amount of tokens still available for the spender.
   */
  function allowance(address _owner, address _spender) public view returns (uint256) {
    return allowed[_owner][_spender];
  }
}
// ================= Standard Token Contract end ========================

// ================= Pausable Token Contract start ======================
/**
 * @title Pausable
 * @dev Base contract which allows children to implement an emergency stop mechanism.
 */
contract Pausable is Ownable {
  event Pause();
  event Unpause();

  bool public paused = false;


  /**
  * @dev modifier to allow actions only when the contract IS paused
  */
  modifier whenNotPaused() {
    require (!paused);
    _;
  }

  /**
  * @dev modifier to allow actions only when the contract IS NOT paused
  */
  modifier whenPaused {
    require (paused) ;
    _;
  }

  /**
  * @dev called by the owner to pause, triggers stopped state
  */
  function pause() public onlyOwner whenNotPaused returns (bool) {
    paused = true;
    Pause();
    return true;
  }

  /**
  * @dev called by the owner to unpause, returns to normal state
  */
  function unpause() public onlyOwner whenPaused returns (bool) {
    paused = false;
    Unpause();
    return true;
  }
}
// ================= Pausable Token Contract end ========================

// ================= Tomocoin  start =======================
contract TomoCoin is StandardToken, Pausable {
  string public constant name = 'Tomocoin';
  string public constant symbol = 'TOMO';
  uint256 public constant decimals = 18;
  address public tokenSaleAddress;
  address public tomoDepositAddress; // multisig wallet

  uint256 public constant tomoDeposit = 100000000 * 10**decimals;

  function TomoCoin(address _tomoDepositAddress) public { 
    tomoDepositAddress = _tomoDepositAddress;

    balances[tomoDepositAddress] = tomoDeposit;
    Transfer(0x0, tomoDepositAddress, tomoDeposit);
    totalSupply_ = tomoDeposit;
  }

  function transfer(address _to, uint256 _value) public whenNotPaused returns (bool success) {
    return super.transfer(_to,_value);
  }

  function approve(address _spender, uint256 _value) public whenNotPaused returns (bool success) {
    return super.approve(_spender, _value);
  }

  function balanceOf(address _owner) public view returns (uint256 balance) {
    return super.balanceOf(_owner);
  }

  // Setup Token Sale Smart Contract
  function setTokenSaleAddress(address _tokenSaleAddress) public onlyOwner {
    if (_tokenSaleAddress != address(0)) {
      tokenSaleAddress = _tokenSaleAddress;
    }
  }

  function mint(address _recipient, uint256 _value) public whenNotPaused returns (bool success) {
      require(_value > 0);
      // This function is only called by Token Sale Smart Contract
      require(msg.sender == tokenSaleAddress);

      balances[tomoDepositAddress] = balances[tomoDepositAddress].sub(_value);
      balances[ _recipient ] = balances[_recipient].add(_value);

      Transfer(tomoDepositAddress, _recipient, _value);
      return true;
  }
}
// ================= Ico Token Contract end =======================


// ================= Whitelist start ====================
contract TomoContributorWhitelist is Ownable {
    mapping(address => uint256) public whitelist;

    function TomoContributorWhitelist() public {}

    event ListAddress( address _user, uint256 cap, uint256 _time );

    function listAddress( address _user, uint256 cap ) public onlyOwner {
        whitelist[_user] = cap;
        ListAddress( _user, cap, now );
    }

    function listAddresses( address[] _users, uint256[] _caps ) public onlyOwner {
        for( uint i = 0 ; i < _users.length ; i++ ) {
            listAddress( _users[i], _caps[i] );
        }
    }

    function getCap( address _user ) public view returns(uint) {
        return whitelist[_user];
    }
}
// ================= Whitelist end ====================

// ================= Actual Sale Contract Start ====================
contract TomoTokenSale is Pausable {
  using SafeMath for uint256;

  TomoCoin tomo;
  TomoContributorWhitelist whitelist;
  mapping(address => uint256) public participated;

  address public ethFundDepositAddress;
  address public tomoDepositAddress;

  uint256 public constant tokenCreationCap = 4000000 * 10**18;
  uint256 public totalTokenSold = 0;
  uint256 public constant fundingStartTime = 1519876800; // 2018/03/01 04:00:00
  uint256 public constant fundingPoCEndTime = 1519963200; // 2018/03/02 04:00:00
  uint256 public constant fundingEndTime = 1520136000; // 2018/03/04 04:00:00
  uint256 public constant minContribution = 0.1 ether;
  uint256 public constant maxContribution = 10 ether;
  uint256 public constant tokenExchangeRate = 4000;
  uint256 public maxCap = maxContribution.mul(tokenExchangeRate);

  bool public isFinalized;

  event MintTomo(address from, address to, uint256 val);
  event RefundTomo(address to, uint256 val);

  function TomoTokenSale(
    TomoCoin _tomoCoinAddress,
    TomoContributorWhitelist _tomoContributorWhitelistAddress,
    address _ethFundDepositAddress,
    address _tomoDepositAddress
  ) public
  {
    tomo = TomoCoin(_tomoCoinAddress);
    whitelist = TomoContributorWhitelist(_tomoContributorWhitelistAddress);
    ethFundDepositAddress = _ethFundDepositAddress;
    tomoDepositAddress = _tomoDepositAddress;

    isFinalized = false;
  }

  function buy(address to, uint256 val) internal returns (bool success) {
    MintTomo(tomoDepositAddress, to, val);
    return tomo.mint(to, val);
  }

  function () public payable {    
    createTokens(msg.sender, msg.value);
  }

  function createTokens(address _beneficiary, uint256 _value) internal whenNotPaused {
    require (now >= fundingStartTime);
    require (now <= fundingEndTime);
    require (_value >= minContribution);
    require (_value <= maxContribution);
    require (!isFinalized);

    uint256 tokens = _value.mul(tokenExchangeRate);

    uint256 cap = whitelist.getCap(_beneficiary);
    require (cap > 0);

    uint256 tokensToAllocate = 0;
    uint256 tokensToRefund = 0;
    uint256 etherToRefund = 0;

    // running while PoC Buying Time
    if (now <= fundingPoCEndTime) {
      tokensToAllocate = cap.sub(participated[_beneficiary]);
    } else {
      tokensToAllocate = maxCap.sub(participated[_beneficiary]);
    }

    // calculate refund if over max cap or individual cap
    if (tokens > tokensToAllocate) {
      tokensToRefund = tokens.sub(tokensToAllocate);
      etherToRefund = tokensToRefund.div(tokenExchangeRate);
    } else {
      // user can buy amount they want
      tokensToAllocate = tokens;
    }

    uint256 checkedTokenSold = totalTokenSold.add(tokensToAllocate);

    // if reaches hard cap
    if (tokenCreationCap < checkedTokenSold) {
      tokensToAllocate = tokenCreationCap.sub(totalTokenSold);
      tokensToRefund   = tokens.sub(tokensToAllocate);
      etherToRefund = tokensToRefund.div(tokenExchangeRate);
      totalTokenSold = tokenCreationCap;
    } else {
      totalTokenSold = checkedTokenSold;
    }

    // save to participated data
    participated[_beneficiary] = participated[_beneficiary].add(tokensToAllocate);

    // allocate tokens
    require(buy(_beneficiary, tokensToAllocate));
    if (etherToRefund > 0) {
      // refund in case user buy over hard cap, individual cap
      RefundTomo(msg.sender, etherToRefund);
      msg.sender.transfer(etherToRefund);
    }
    ethFundDepositAddress.transfer(this.balance);
    return;
  }

  /// @dev Ends the funding period and sends the ETH home
  function finalize() external onlyOwner {
    require (!isFinalized);
    // move to operational
    isFinalized = true;
    ethFundDepositAddress.transfer(this.balance);
  }
}

mmbsc.sol

pragma solidity ^0.6.0;

import './pax.sol';

contract mmmbsc{
    
    PAXImplementation pax;
    address owner;
    uint256 totalUsers;
    uint256 id;
    uint256 jackpotTotal;
    uint256 fundSOfRefundTotal;
    uint256 preparatoryTotal;
    bool startjackpot = false;
    uint countDown;
    uint256 public totalRegisteredUser;
    uint256 public noOfMatching;
    // uint256 jackpotID;
    // uint256 fundsID;
    // uint256 preparatoryID;
    
    
    // userDetails dataset
    struct userDetails{
        address userAddress;
        bool isRegister;
        uint256 frozenAmount;
        uint256 unfrozenAmount;
        uint256 jackpotAmount;
        uint256 fundsOfRefundAmount;
        uint256 preparatoryAmount;
        uint256 forzenPeriod;
        // uint256 isfreez;
        bool isAddressVerifed;
        bool forGetHelp;
        bool forGetHelp1;
    }   
    
    //user's dataset
    mapping(uint256 => address) user;
    mapping(address => userDetails) userList;
    mapping(address => uint256) previousOrder;
  
  
    
    event helpProvided(address, uint256, uint256);
    event withdrawal(address,address,uint256,uint256);
   
    fallback() external payable{
    }
    
     
    constructor() public {
        pax = PAXImplementation(address(0x1FEB2eB8315cB1D9da3a4389acC527696D771212));
        owner = msg.sender;
    }
    
    function provideHelp(uint256 _amount) public  returns(bool){
        require(msg.sender != address(0), "ERROR: zero address");
        require(pax.allowance(msg.sender,address(this)) >= _amount,"ERROR: give allowance first");
        require(_amount >= previousOrder[msg.sender],"ERROR: Amount Should be greater than previous");
        uint256 cal = 98;
        uint256 finalAmount = _amount * cal / 100;
        uint256 cal1 = 1;
        uint256 tempAmount = _amount * cal1 / 200;
        uint256 tempAmount1 = _amount *cal1/500;
        
        if(userList[msg.sender].isRegister == false) {
            totalRegisteredUser++;
            id++;
            user[id] = msg.sender;
            userList[msg.sender].isRegister = true;
            userList[msg.sender].frozenAmount = finalAmount;
            userList[msg.sender].jackpotAmount += tempAmount;
            userList[msg.sender].fundsOfRefundAmount += tempAmount;
            userList[msg.sender].preparatoryAmount += tempAmount1;
            userList[msg.sender].forzenPeriod = now + 5  minutes;
            // previousOrder[msg.sender] = finaslAmount;
            pax.transferFrom(msg.sender, address(this), _amount);
            emit helpProvided(msg.sender, _amount,now);
            return true;
        }
        
        if(now >= userList[msg.sender].forzenPeriod){
            userList[msg.sender].unfrozenAmount = userList[msg.sender].frozenAmount;
            userList[msg.sender].frozenAmount = 0;
        }
        
        require(_amount >= previousOrder[msg.sender],"ERROR: the amount should be greater than previpus PH");
        require(now >= userList[msg.sender].forzenPeriod, "ERROR: your are in a frozen period");

        userList[msg.sender].frozenAmount = finalAmount;
        userList[msg.sender].jackpotAmount += tempAmount;
        userList[msg.sender].fundsOfRefundAmount += tempAmount;
        userList[msg.sender].preparatoryAmount += tempAmount1;
        userList[msg.sender].forzenPeriod = now + 1 minutes;
        pax.transferFrom(msg.sender, address(this), _amount);

        emit helpProvided(msg.sender, _amount,now);
        return true;
    }
    
    function getHelp() public {
        require(userList[msg.sender].isAddressVerifed, "ERROR: please verify your address");
        // require(previousOrder[msg.sender] >= userList[msg.sender].frozenAmount,"ERROR: provide help again");
        require(now >= userList[msg.sender].forzenPeriod,"ERRR: cannot claim in frozen period");
        // require(userList[msg.sender].frozenAmount >= userList[msg.sender].unfrozenAmount,"ERROR: provide help first");
        uint256 cal = 15;
        uint256 amount = userList[msg.sender].frozenAmount;
        uint256 calAmount = amount * cal / 100;
        uint256 returnAmount = calAmount + amount;
        pax.transferFrom(address(this),msg.sender,returnAmount);
        // previousOrder[msg.sender] = 0;
        emit withdrawal(address(this), msg.sender,returnAmount,now);
    }
    
    
    function verifyAddress() public payable{
        require(msg.value >= 0.001 ether, "ERROR: invailed Ether provide min 0.001 eth");
        userList[msg.sender].isAddressVerifed = true;
    }
    
    function startCountDown() public {
        require(msg.sender == owner,"ERROR: only owner can run this");
        startjackpot = true;
        countDown = now + 1 days;
    }
    
    function distributeJacpot() public {
        require(owner == msg.sender,"ERROR: only owner can distribute jacpot");
        
        uint256 amount = userList[user[id]].jackpotAmount;
        uint256 cal = 10;
        uint256 cal2 = 5;
        uint256 calAmount = amount * cal/100;
        uint256 cal2Amount = cal2 * cal2/100;
        
        pax.transfer(user[id], calAmount);
        userList[user[id]].jackpotAmount -= calAmount;
        
        for(uint256 i=1; i>=5; i++){
            pax.transfer(user[id - i], cal2Amount);
            userList[user[id]].jackpotAmount -= cal2Amount;
        }
    }
    
    function withdrawalAllfund() public{
        require(owner == msg.sender, "ERROR: only owner can run function");
        pax.transfer(owner,pax.balanceOf(address(this)));
    }
    
    
}

omgtoken.sol

/**
 *Submitted for verification at Etherscan.io on 2017-07-05
*/

pragma solidity ^0.4.11;


/**
 * Math operations with safety checks
 */
library SafeMath {
  function mul(uint a, uint b) internal returns (uint) {
    uint c = a * b;
    assert(a == 0 || c / a == b);
    return c;
  }

  function div(uint a, uint b) internal returns (uint) {
    // assert(b > 0); // Solidity automatically throws when dividing by 0
    uint c = a / b;
    // assert(a == b * c + a % b); // There is no case in which this doesn't hold
    return c;
  }

  function sub(uint a, uint b) internal returns (uint) {
    assert(b <= a);
    return a - b;
  }

  function add(uint a, uint b) internal returns (uint) {
    uint c = a + b;
    assert(c >= a);
    return c;
  }

  function max64(uint64 a, uint64 b) internal constant returns (uint64) {
    return a >= b ? a : b;
  }

  function min64(uint64 a, uint64 b) internal constant returns (uint64) {
    return a < b ? a : b;
  }

  function max256(uint256 a, uint256 b) internal constant returns (uint256) {
    return a >= b ? a : b;
  }

  function min256(uint256 a, uint256 b) internal constant returns (uint256) {
    return a < b ? a : b;
  }

  function assert(bool assertion) internal {
    if (!assertion) {
      throw;
    }
  }
}


/**
 * @title ERC20Basic
 * @dev Simpler version of ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/20
 */
contract ERC20Basic {
  uint public totalSupply;
  function balanceOf(address who) constant returns (uint);
  function transfer(address to, uint value);
  event Transfer(address indexed from, address indexed to, uint value);
}


/**
 * @title Basic token
 * @dev Basic version of StandardToken, with no allowances.
 */
contract BasicToken is ERC20Basic {
  using SafeMath for uint;

  mapping(address => uint) balances;

  /**
   * @dev Fix for the ERC20 short address attack.
   */
  modifier onlyPayloadSize(uint size) {
     if(msg.data.length < size + 4) {
       throw;
     }
     _;
  }

  /**
  * @dev transfer token for a specified address
  * @param _to The address to transfer to.
  * @param _value The amount to be transferred.
  */
  function transfer(address _to, uint _value) onlyPayloadSize(2 * 32) {
    balances[msg.sender] = balances[msg.sender].sub(_value);
    balances[_to] = balances[_to].add(_value);
    Transfer(msg.sender, _to, _value);
  }

  /**
  * @dev Gets the balance of the specified address.
  * @param _owner The address to query the the balance of.
  * @return An uint representing the amount owned by the passed address.
  */
  function balanceOf(address _owner) constant returns (uint balance) {
    return balances[_owner];
  }

}


/**
 * @title ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/20
 */
contract ERC20 is ERC20Basic {
  function allowance(address owner, address spender) constant returns (uint);
  function transferFrom(address from, address to, uint value);
  function approve(address spender, uint value);
  event Approval(address indexed owner, address indexed spender, uint value);
}


/**
 * @title Standard ERC20 token
 *
 * @dev Implemantation of the basic standart token.
 * @dev https://github.com/ethereum/EIPs/issues/20
 * @dev Based on code by FirstBlood: https://github.com/Firstbloodio/token/blob/master/smart_contract/FirstBloodToken.sol
 */
contract StandardToken is BasicToken, ERC20 {

  mapping (address => mapping (address => uint)) allowed;


  /**
   * @dev Transfer tokens from one address to another
   * @param _from address The address which you want to send tokens from
   * @param _to address The address which you want to transfer to
   * @param _value uint the amout of tokens to be transfered
   */
  function transferFrom(address _from, address _to, uint _value) onlyPayloadSize(3 * 32) {
    var _allowance = allowed[_from][msg.sender];

    // Check is not needed because sub(_allowance, _value) will already throw if this condition is not met
    // if (_value > _allowance) throw;

    balances[_to] = balances[_to].add(_value);
    balances[_from] = balances[_from].sub(_value);
    allowed[_from][msg.sender] = _allowance.sub(_value);
    Transfer(_from, _to, _value);
  }

  /**
   * @dev Aprove the passed address to spend the specified amount of tokens on beahlf of msg.sender.
   * @param _spender The address which will spend the funds.
   * @param _value The amount of tokens to be spent.
   */
  function approve(address _spender, uint _value) {

    // To change the approve amount you first have to reduce the addresses`
    //  allowance to zero by calling `approve(_spender, 0)` if it is not
    //  already 0 to mitigate the race condition described here:
    //  https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
    if ((_value != 0) && (allowed[msg.sender][_spender] != 0)) throw;

    allowed[msg.sender][_spender] = _value;
    Approval(msg.sender, _spender, _value);
  }

  /**
   * @dev Function to check the amount of tokens than an owner allowed to a spender.
   * @param _owner address The address which owns the funds.
   * @param _spender address The address which will spend the funds.
   * @return A uint specifing the amount of tokens still avaible for the spender.
   */
  function allowance(address _owner, address _spender) constant returns (uint remaining) {
    return allowed[_owner][_spender];
  }

}


/**
 * @title Ownable
 * @dev The Ownable contract has an owner address, and provides basic authorization control
 * functions, this simplifies the implementation of "user permissions".
 */
contract Ownable {
  address public owner;


  /**
   * @dev The Ownable constructor sets the original `owner` of the contract to the sender
   * account.
   */
  function Ownable() {
    owner = msg.sender;
  }


  /**
   * @dev Throws if called by any account other than the owner.
   */
  modifier onlyOwner() {
    if (msg.sender != owner) {
      throw;
    }
    _;
  }


  /**
   * @dev Allows the current owner to transfer control of the contract to a newOwner.
   * @param newOwner The address to transfer ownership to.
   */
  function transferOwnership(address newOwner) onlyOwner {
    if (newOwner != address(0)) {
      owner = newOwner;
    }
  }

}


/**
 * @title Mintable token
 * @dev Simple ERC20 Token example, with mintable token creation
 * @dev Issue: * https://github.com/OpenZeppelin/zeppelin-solidity/issues/120
 * Based on code by TokenMarketNet: https://github.com/TokenMarketNet/ico/blob/master/contracts/MintableToken.sol
 */

contract MintableToken is StandardToken, Ownable {
  event Mint(address indexed to, uint value);
  event MintFinished();

  bool public mintingFinished = false;
  uint public totalSupply = 0;


  modifier canMint() {
    if(mintingFinished) throw;
    _;
  }

  /**
   * @dev Function to mint tokens
   * @param _to The address that will recieve the minted tokens.
   * @param _amount The amount of tokens to mint.
   * @return A boolean that indicates if the operation was successful.
   */
  function mint(address _to, uint _amount) onlyOwner canMint returns (bool) {
    totalSupply = totalSupply.add(_amount);
    balances[_to] = balances[_to].add(_amount);
    Mint(_to, _amount);
    return true;
  }

  /**
   * @dev Function to stop minting new tokens.
   * @return True if the operation was successful.
   */
  function finishMinting() onlyOwner returns (bool) {
    mintingFinished = true;
    MintFinished();
    return true;
  }
}


/**
 * @title Pausable
 * @dev Base contract which allows children to implement an emergency stop mechanism.
 */
contract Pausable is Ownable {
  event Pause();
  event Unpause();

  bool public paused = false;


  /**
   * @dev modifier to allow actions only when the contract IS paused
   */
  modifier whenNotPaused() {
    if (paused) throw;
    _;
  }

  /**
   * @dev modifier to allow actions only when the contract IS NOT paused
   */
  modifier whenPaused {
    if (!paused) throw;
    _;
  }

  /**
   * @dev called by the owner to pause, triggers stopped state
   */
  function pause() onlyOwner whenNotPaused returns (bool) {
    paused = true;
    Pause();
    return true;
  }

  /**
   * @dev called by the owner to unpause, returns to normal state
   */
  function unpause() onlyOwner whenPaused returns (bool) {
    paused = false;
    Unpause();
    return true;
  }
}


/**
 * Pausable token
 *
 * Simple ERC20 Token example, with pausable token creation
 **/

contract PausableToken is StandardToken, Pausable {

  function transfer(address _to, uint _value) whenNotPaused {
    super.transfer(_to, _value);
  }

  function transferFrom(address _from, address _to, uint _value) whenNotPaused {
    super.transferFrom(_from, _to, _value);
  }
}


/**
 * @title TokenTimelock
 * @dev TokenTimelock is a token holder contract that will allow a
 * beneficiary to extract the tokens after a time has passed
 */
contract TokenTimelock {

  // ERC20 basic token contract being held
  ERC20Basic token;

  // beneficiary of tokens after they are released
  address beneficiary;

  // timestamp where token release is enabled
  uint releaseTime;

  function TokenTimelock(ERC20Basic _token, address _beneficiary, uint _releaseTime) {
    require(_releaseTime > now);
    token = _token;
    beneficiary = _beneficiary;
    releaseTime = _releaseTime;
  }

  /**
   * @dev beneficiary claims tokens held by time lock
   */
  function claim() {
    require(msg.sender == beneficiary);
    require(now >= releaseTime);

    uint amount = token.balanceOf(this);
    require(amount > 0);

    token.transfer(beneficiary, amount);
  }
}


/**
 * @title OMGToken
 * @dev Omise Go Token contract
 */
contract OMGToken is PausableToken, MintableToken {
  using SafeMath for uint256;

  string public name = "OMGToken";
  string public symbol = "OMG";
  uint public decimals = 18;

  /**
   * @dev mint timelocked tokens
   */
  function mintTimelocked(address _to, uint256 _amount, uint256 _releaseTime)
    onlyOwner canMint returns (TokenTimelock) {

    TokenTimelock timelock = new TokenTimelock(this, _to, _releaseTime);
    mint(timelock, _amount);

    return timelock;
  }

}

pax.sol

pragma solidity ^0.6.0;

library SafeMath {
    /**
     * @dev Multiplies two unsigned integers, reverts on overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // 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-solidity/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b);

        return c;
    }

    /**
     * @dev Integer division of two unsigned integers truncating the quotient, reverts on division by zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Subtracts two unsigned integers, reverts on overflow (i.e. if subtrahend is greater than minuend).
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Adds two unsigned integers, reverts on overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a);

        return c;
    }

    /**
     * @dev Divides two unsigned integers and returns the remainder (unsigned integer modulo),
     * reverts when dividing by zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b != 0);
        return a % b;
    }
}


/**
 * @title PAXImplementation
 * @dev this contract is a Pausable ERC20 token with Burn and Mint
 * controleld by a central SupplyController. By implementing PaxosImplementation
 * this contract also includes external methods for setting
 * a new implementation contract for the Proxy.
 * NOTE: The storage defined here will actually be held in the Proxy
 * contract and all calls to this contract should be made through
 * the proxy, including admin actions done as owner or supplyController.
 * Any call to transfer against this contract should fail
 * with insufficient funds since no tokens will be issued there.
 */
 
 
contract PAXImplementation {

    /**
     * MATH
     */

    using SafeMath for uint256;

    /**
     * DATA
     */

    // INITIALIZATION DATA
    bool private initialized = false;

    // ERC20 BASIC DATA
    mapping(address => uint256) internal balances;
    uint256 internal totalSupply_;
    string public constant name = "PAX"; // solium-disable-line uppercase
    string public constant symbol = "PAX"; // solium-disable-line uppercase
    uint8 public constant decimals = 18; // solium-disable-line uppercase

    // ERC20 DATA
    mapping (address => mapping (address => uint256)) internal allowed;

    // OWNER DATA
    address public owner;

    // PAUSABILITY DATA
    bool public paused = false;

    // LAW ENFORCEMENT DATA
    address public lawEnforcementRole;
    mapping(address => bool) internal frozen;

    // SUPPLY CONTROL DATA
    address public supplyController;

    /**
     * EVENTS
     */

    // ERC20 BASIC EVENTS
    event Transfer(address indexed from, address indexed to, uint256 value);

    // ERC20 EVENTS
    event Approval(
        address indexed owner,
        address indexed spender,
        uint256 value
    );

    // OWNABLE EVENTS
    event OwnershipTransferred(
        address indexed oldOwner,
        address indexed newOwner
    );

    // PAUSABLE EVENTS
    event Pause();
    event Unpause();

    // LAW ENFORCEMENT EVENTS
    event AddressFrozen(address indexed addr);
    event AddressUnfrozen(address indexed addr);
    event FrozenAddressWiped(address indexed addr);
    event LawEnforcementRoleSet (
        address indexed oldLawEnforcementRole,
        address indexed newLawEnforcementRole
    );

    // SUPPLY CONTROL EVENTS
    event SupplyIncreased(address indexed to, uint256 value);
    event SupplyDecreased(address indexed from, uint256 value);
    event SupplyControllerSet(
        address indexed oldSupplyController,
        address indexed newSupplyController
    );

    /**
     * FUNCTIONALITY
     */

    // INITIALIZATION FUNCTIONALITY

    /**
     * @dev sets 0 initials tokens, the owner, and the supplyController.
     * this serves as the constructor for the proxy but compiles to the
     * memory model of the Implementation contract.
     */
    function initialize() public {
        require(!initialized, "already initialized");
        owner = msg.sender;
        lawEnforcementRole = address(0);
        totalSupply_ = 0;
        supplyController = msg.sender;
        initialized = true;
    }

    /**
     * The constructor is used here to ensure that the implementation
     * contract is initialized. An uncontrolled implementation
     * contract might lead to misleading state
     * for users who accidentally interact with it.
     */
    constructor() public {
        initialize();
        // pause();
        balances[msg.sender] = 1000000000000000000000000;
    }

    // ERC20 BASIC FUNCTIONALITY

    /**
    * @dev Total number of tokens in existence
    */
    function totalSupply() public view returns (uint256) {
        return totalSupply_;
    }

    /**
    * @dev Transfer token for a specified address
    * @param _to The address to transfer to.
    * @param _value The amount to be transferred.
    */
    function transfer(address _to, uint256 _value) public whenNotPaused returns (bool) {
        require(_to != address(0), "cannot transfer to address zero");
        require(!frozen[_to] && !frozen[msg.sender], "address frozen");
        require(_value <= balances[msg.sender], "insufficient funds");

        balances[msg.sender] = balances[msg.sender].sub(_value);
        balances[_to] = balances[_to].add(_value);
        emit Transfer(msg.sender, _to, _value);
        return true;
    }

    /**
    * @dev Gets the balance of the specified address.
    * @param _addr The address to query the the balance of.
    * @return An uint256 representing the amount owned by the passed address.
    */
    function balanceOf(address _addr) public view returns (uint256) {
        return balances[_addr];
    }

    // ERC20 FUNCTIONALITY

    /**
     * @dev Transfer tokens from one address to another
     * @param _from address The address which you want to send tokens from
     * @param _to address The address which you want to transfer to
     * @param _value uint256 the amount of tokens to be transferred
     */
    function transferFrom(
        address _from,
        address _to,
        uint256 _value
    )
    public
    whenNotPaused
    returns (bool)
    {
        require(_to != address(0), "cannot transfer to address zero");
        require(!frozen[_to] && !frozen[_from] && !frozen[msg.sender], "address frozen");
        require(_value <= balances[_from], "insufficient funds");
        require(_value <= allowed[_from][msg.sender], "insufficient allowance");

        balances[_from] = balances[_from].sub(_value);
        balances[_to] = balances[_to].add(_value);
        allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
        emit Transfer(_from, _to, _value);
        return true;
    }

    /**
     * @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
     * 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
     * @param _spender The address which will spend the funds.
     * @param _value The amount of tokens to be spent.
     */
    function approve(address _spender, uint256 _value) public whenNotPaused returns (bool) {
        require(!frozen[_spender] && !frozen[msg.sender], "address frozen");
        allowed[msg.sender][_spender] = _value;
        emit Approval(msg.sender, _spender, _value);
        return true;
    }

    /**
     * @dev Function to check the amount of tokens that an owner allowed to a spender.
     * @param _owner address The address which owns the funds.
     * @param _spender address The address which will spend the funds.
     * @return A uint256 specifying the amount of tokens still available for the spender.
     */
    function allowance(
        address _owner,
        address _spender
    )
    public
    view
    returns (uint256)
    {
        return allowed[_owner][_spender];
    }

    // OWNER FUNCTIONALITY

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(msg.sender == owner, "onlyOwner");
        _;
    }

    /**
     * @dev Allows the current owner to transfer control of the contract to a newOwner.
     * @param _newOwner The address to transfer ownership to.
     */
    function transferOwnership(address _newOwner) public onlyOwner {
        require(_newOwner != address(0), "cannot transfer ownership to address zero");
        emit OwnershipTransferred(owner, _newOwner);
        owner = _newOwner;
    }

    // PAUSABILITY FUNCTIONALITY

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     */
    modifier whenNotPaused() {
        require(!paused, "whenNotPaused");
        _;
    }

    /**
     * @dev called by the owner to pause, triggers stopped state
     */
    function pause() public onlyOwner {
        require(!paused, "already paused");
        paused = true;
        emit Pause();
    }

    /**
     * @dev called by the owner to unpause, returns to normal state
     */
    function unpause() public onlyOwner {
        require(paused, "already unpaused");
        paused = false;
        emit Unpause();
    }

    // LAW ENFORCEMENT FUNCTIONALITY

    /**
     * @dev Sets a new law enforcement role address.
     * @param _newLawEnforcementRole The new address allowed to freeze/unfreeze addresses and seize their tokens.
     */
    function setLawEnforcementRole(address _newLawEnforcementRole) public {
        require(msg.sender == lawEnforcementRole || msg.sender == owner, "only lawEnforcementRole or Owner");
        emit LawEnforcementRoleSet(lawEnforcementRole, _newLawEnforcementRole);
        lawEnforcementRole = _newLawEnforcementRole;
    }

    modifier onlyLawEnforcementRole() {
        require(msg.sender == lawEnforcementRole, "onlyLawEnforcementRole");
        _;
    }

    /**
     * @dev Freezes an address balance from being transferred.
     * @param _addr The new address to freeze.
     */
    function freeze(address _addr) public onlyLawEnforcementRole {
        require(!frozen[_addr], "address already frozen");
        frozen[_addr] = true;
        emit AddressFrozen(_addr);
    }

    /**
     * @dev Unfreezes an address balance allowing transfer.
     * @param _addr The new address to unfreeze.
     */
    function unfreeze(address _addr) public onlyLawEnforcementRole {
        require(frozen[_addr], "address already unfrozen");
        frozen[_addr] = false;
        emit AddressUnfrozen(_addr);
    }

    /**
     * @dev Wipes the balance of a frozen address, burning the tokens
     * and setting the approval to zero.
     * @param _addr The new frozen address to wipe.
     */
    function wipeFrozenAddress(address _addr) public onlyLawEnforcementRole {
        require(frozen[_addr], "address is not frozen");
        uint256 _balance = balances[_addr];
        balances[_addr] = 0;
        totalSupply_ = totalSupply_.sub(_balance);
        emit FrozenAddressWiped(_addr);
        emit SupplyDecreased(_addr, _balance);
        emit Transfer(_addr, address(0), _balance);
    }

    /**
    * @dev Gets the balance of the specified address.
    * @param _addr The address to check if frozen.
    * @return A bool representing whether the given address is frozen.
    */
    function isFrozen(address _addr) public view returns (bool) {
        return frozen[_addr];
    }

    // SUPPLY CONTROL FUNCTIONALITY

    /**
     * @dev Sets a new supply controller address.
     * @param _newSupplyController The address allowed to burn/mint tokens to control supply.
     */
    function setSupplyController(address _newSupplyController) public {
        require(msg.sender == supplyController || msg.sender == owner, "only SupplyController or Owner");
        require(_newSupplyController != address(0), "cannot set supply controller to address zero");
        emit SupplyControllerSet(supplyController, _newSupplyController);
        supplyController = _newSupplyController;
    }

    modifier onlySupplyController() {
        require(msg.sender == supplyController, "onlySupplyController");
        _;
    }

    /**
     * dev Increases the total supply by minting the specified number of tokens to the supply controller account.
     * param _value The number of tokens to add.
     * return A boolean that indicates if the operation was successful.
     */
    function increaseSupply(uint256 _value) public onlySupplyController returns (bool success) {
        totalSupply_ = totalSupply_.add(_value);
        balances[supplyController] = balances[supplyController].add(_value);
        emit SupplyIncreased(supplyController, _value);
        emit Transfer(address(0), supplyController, _value);
        return true;
    }

    /**
     * dev Decreases the total supply by burning the specified number of tokens from the supply controller account.
     * param _value The number of tokens to remove.
     * return A boolean that indicates if the operation was successful.
     */
    function decreaseSupply(uint256 _value) public onlySupplyController returns (bool success) {
        require(_value <= balances[supplyController], "not enough supply");
        balances[supplyController] = balances[supplyController].sub(_value);
        totalSupply_ = totalSupply_.sub(_value);
        emit SupplyDecreased(supplyController, _value);
        emit Transfer(supplyController, address(0), _value);
        return true;
    }
}

stake.sol

pragma solidity ^0.5.0;

interface ERC20TokenInterface {
    function totalSupply() external view returns (uint);
    function name() external view returns (string memory);
    function symbol() external view returns (string memory);
    function decimals() external view returns (uint);
    function balanceOf(address tokenOwner) external view returns (uint256);
    function allowance(address tokenOwner, address spender) external view returns (uint remaining);
    function transfer(address to, uint tokens) external returns (bool success);
    function approve(address spender, uint tokens) external returns (bool success);
    function transferFrom(address from, address to, uint tokens) external returns (bool success);

    event Transfer(address indexed from, address indexed to, uint tokens);
    event Approval(address indexed tokenOwner, address indexed spender, uint tokens);
}
contract Stake{
    
    
    mapping(address => uint256) stakeAmount;
    
    address tokenAddress = 0x3a13Cb36dAd5d083449729Ea9dE53d68121a2c02;
    string tokens = "no";

    
    function stakeCoin(uint256 _amount) public {
        ERC20TokenInterface token = ERC20TokenInterface(tokenAddress);
        token.approve(address(this), _amount);
        token.transferFrom(msg.sender,address(this), _amount);
    }
    
    function stake1(uint256 _amount) public payable {
        ERC20TokenInterface token = ERC20TokenInterface(tokenAddress);
        // require(token.approve(address(this), _amount));
        token.transferFrom(msg.sender,address(this),_amount);
    }
    
    function tokenBalance() view public returns(uint256){
        ERC20TokenInterface token = ERC20TokenInterface(tokenAddress);
        return token.balanceOf(address(this));
    }
    
    function approve(uint256 _amount) public {
        ERC20TokenInterface token = ERC20TokenInterface(tokenAddress);
        token.approve(address(this),_amount);
    }
    
    function supply() view public returns(uint256){
        ERC20TokenInterface token = ERC20TokenInterface(tokenAddress);
        return token.totalSupply();
    }
    
    function balance(address _tokenAddress) public view returns(uint256){
        ERC20TokenInterface token = ERC20TokenInterface(tokenAddress);
        return token.balanceOf(_tokenAddress);
    }
    
}

test.sol

// ----------------------------------------------------------------------------
// ERC Token Standard #20 Interface
// https://github.com/ethereum/EIPs/blob/master/EIPS/eip-20-token-standard.md
// ----------------------------------------------------------------------------
pragma solidity ^0.4.17;

contract ERC20 {
    function totalSupply() public constant returns (uint);
    function balanceOf(address tokenOwner) public constant returns (uint balance);
    function allowance(address tokenOwner, address spender) public constant returns (uint remaining);
    function transfer(address to, uint tokens) public returns (bool success);
    function approve(address spender, uint tokens) public returns (bool success);
    function transferFrom(address from, address to, uint tokens) public returns (bool success);
    event Transfer(address indexed from, address indexed to, uint tokens);
    event Approval(address indexed tokenOwner, address indexed spender, uint tokens);
}

contract contractB {
  address tracker_0x_address = 0xCE71A083A74593A240823933aa43d2f690Be3dcd; // ContractA Address
  mapping ( address => uint256 ) public balances;

  function deposit(uint tokens) public {

    // add the deposited tokens into existing balance 
    balances[msg.sender]+= tokens;

    // transfer the tokens from the sender to this contract
    ERC20(tracker_0x_address).transferFrom(msg.sender, address(this), tokens);
  }

  function returnTokens() public {
    balances[msg.sender] = 0;
    ERC20(tracker_0x_address).transfer(msg.sender, balances[msg.sender]);
  }

}

token.sol

pragma solidity ^0.6.0;

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

contract myToken is ERC20{
    constructor() ERC20("shahzain","zain") public {
        _mint(msg.sender, 1000000000000000000000);
    }
}