SimpleContract.sol

// SPDX-License-Identifier: CC0-1.0

/// @title Simple Contract for Experimentation

/**
 *        ><<    ><<<<< ><<    ><<      ><<
 *      > ><<          ><<      ><<      ><<
 *     >< ><<         ><<       ><<      ><<
 *   ><<  ><<        ><<        ><<      ><<
 *  ><<<< >< ><<     ><<        ><<      ><<
 *        ><<        ><<       ><<<<    ><<<<
 */

pragma solidity ^0.8.17;

contract SimpleContract {
    address public owner;

    constructor() {
        owner = msg.sender;
    }

    modifier onlyOwner() {
        // solhint-disable-next-line reason-string
        require(msg.sender == owner);
        _;
    }

    function withdraw() external onlyOwner {
        payable(msg.sender).transfer(address(this).balance);
    }
}