Crowdfunding Smart Contract

CrowdFunding.sol

contract Crowdfunding {
    address recipient; uint goal; uint deadline;
    struct Contribution { address contributor; uint amount; }
    Contribution[] contributions;
    uint contributed;
    function Crowdfunding(address _recipient, uint256 _goal, uint256 _deadline) {
        recipient = _recipient;
        goal = _goal;
        deadline = _deadline;
    }
    function () {
        contributions[contributions.length++] = Contribution(msg.sender, msg.value);
        contributed += msg.value;
    }
    modifier afterDeadline() { if (now >= deadline) _ }
    function checkGoalReached() afterDeadline {
        if (contributed < goal)
            for (uint i = 0; i < contributions.length; ++i)
                contributions[i].contributor.send(contributions[i].amount);
        suicide(recipient);
    }
}