extra.txt

event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    constructor(address _contractOwner) {
        s.contractOwner = _contractOwner;
    }

    function owner() external view returns (address) {
        return s.contractOwner;
    }

    function transferOwnership(address _newContractOwner) external {
        address previousOwner = s.contractOwner;
        require(msg.sender == previousOwner, "Raffle: Must be contract owner");
        s.contractOwner = _newContractOwner;
        emit OwnershipTransferred(previousOwner, _newContractOwner);
    }