error.sol

// SPDX-License-Identifier: GPL-3.0
pragma solidity ^0.8.4;
/// ogbeni
error Unauthorized();
/// @custom:experimental This is an experimental contract.
contract VendingMachine {
    address payable owner = payable(msg.sender);

    function withdraw() public {
        if (msg.sender != owner)
            revert Unauthorized();

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

}