BoxHand.sol

// solidity

// SPDX-License-Identifier: MIT
pragma solidity 0.8.30;

contract BoxHand {

    address[] public s_participants;
    mapping(address => uint256) public s_addressToAmountFunded;
    uint256 public i_entranceFee;
    address public i_owner;

    constructor(uint256 _entranceFee) {
        i_entranceFee = _entranceFee;
        i_owner = msg.sender;
    }

    function contribute() public payable {
        require(msg.value > 0 , "Need more than ZERO!");
        s_participants.push(msg.sender);
        s_addressToAmountFunded[msg.sender] += msg.value;
    }

    modifier onlyOwner {
    require(msg.sender == i_owner, "Sender is not owner!");
    _;
    }

    function payout(address payable _winner) public onlyOwner {

        uint256 totalPot = address(this).balance;
        (bool success, ) = _winner.call{value: totalPot}("");
        require(success, "Transfer failed");
    }
}