gulerburak

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.17; // latest version

contract FeeCollector{
    address public owner; // owner of the contract
    uint public balance; // total balance in contract

    constructor() {
        owner = msg.sender; // assign owner
    }

gulerburak

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.17;

contract ToDoList{

    // to-do item
    struct ToDo {
        string text;
        bool completed;
    }

gulerburak

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.17;

interface IERC20 {
    function transfer(address, uint) external returns (bool);

    function transferFrom(
        address,
        address,
        uint