Week2

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.19;
contract deathswitch{
    address public owner;
    uint public lastaliveblock;
    address public presetaddress;
    modifier onlyOwner() {
        require(msg.sender == owner, "Not the owner");
        _;
    }
    constructor(address _presetaddress) onlyOwner{
        owner = msg.sender;
        presetaddress = _presetaddress;
        lastaliveblock = block.number;
    }
    function stillAlive() external onlyOwner {
        lastaliveblock = block.number;
    }
    function send()  external {
        require(block.number - lastaliveblock>10,"owner is inactive");
        uint balance = address(this).balance;
        payable(presetaddress).transfer(balance);
        (bool success,)=presetaddress.call{value:balance}("");
        require(success, "Transfer failed");
    }
    receive() external payable {}
}