// SPDX-License-Identifier: UNLICENSED
pragma solidity 0.8.18;
contract Challenge {

	bool setup = false;
	address payable owner = payable(address(0x0));
	mapping(address => bool) public sameAddress;
	
	constructor() payable {
		if( sameAddress[address(0x0)] ) {
			init(); 
		}
	}

	modifier onlyOwner {
		require(msg.sender == owner);
		_;
	}
	
	function init() public {
		if( setup == false){ 
			setup = true;
			owner = payable(msg.sender);
		}
	}
	
	function withdrawAll() public onlyOwner {
		owner.transfer(address(this).balance);
	}
	
	function destroy() public onlyOwner {
		selfdestruct(owner);
	}
}