donation example of solidity

donation.sol

pragma solidity ^0.4.25;

contract Donation {
    uint fundLimit = 1 ether;
    address owner;
    event fundMoved(address _to, uint _amount);
    modifier onlyowner { if (msg.sender == owner) _; }
    address[] _giver;
    uint[] _values;

    constructor () public {
        owner = msg.sender;
    }

    function donate() public payable {
        addGiver(msg.value);
    }
    function getFundLimit() public view returns (uint) {
        return fundLimit;
    }

    function moveFund(address _to, uint _amount) onlyowner public {
        uint balance = address(this).balance;
        if (_amount <= balance) {
            if (_to.send(balance)) {
                emit fundMoved(_to, _amount);    
            } else {
                revert();
            }
        } else {
            revert();
        }
    }

    function addGiver(uint _amount) internal {
        _giver.push(msg.sender);
        _values.push(_amount);
    }
}