Created using remix-ide: Realtime Ethereum Contract Compiler and Runtime. Load this file by pasting this gists URL or ID at https://remix.ethereum.org/#version=soljson-v0.4.24+commit.e67f0147.js&optimize=true&gist=

crowdfund.sol

pragma solidity ^0.4.24;

import "./mortal.sol";


contract Crowdfund {
    struct Funder {
        address addr;
        uint amount;
    }
    
    struct Project {
        bool created;
        bool opened;
        string name;
        address owner;
        mapping (uint => Funder) funders;
        uint fundersSize;
        uint amount;
        uint fundingGoal;
    }
    
    event ProjectCreated (string _name, uint _fundingGoal);
    event FundTransferred (address _backer, string _project, uint _amount, uint _remainingAmount);
    event fundingGoalReached (string project);
    
    
    address private owner;
    mapping (string => Project) private projects;
    
    
    modifier ProjectNotExists (string _name) {
        require (projects[_name].created == false);
        _;
    }
    
    modifier ProjectExists (string _name) {
        require (projects[_name].created == true);
        _;
    }
    
    
    
    constructor () public {
        owner= msg.sender;
    }
    
    
    
    function createProject (string _projectName, uint _amount) public ProjectNotExists (_projectName) {
        projects[_projectName]= Project (true, true, _projectName, msg.sender, 0, 0, _amount);
        emit ProjectCreated (_projectName, _amount);
    }
    
    
    
    function sendMoney (string _projectName, uint _sum) public ProjectExists (_projectName) {
        Project storage p= projects[_projectName];
        p.funders[p.fundersSize]= Funder (msg.sender, _sum);
        p.fundersSize++;
        p.amount += _sum;
        uint remaining= p.fundingGoal - _sum;
        emit FundTransferred (msg.sender, _projectName, _sum, remaining);
        checkGoalReached (_projectName);
    }
    
    
    
    function checkGoalReached (string _projectName) private returns (bool) {
        Project storage p= projects[_projectName];
        if (p.fundingGoal <= p.amount) {
            emit fundingGoalReached (_projectName);
            p.opened= false;
            return true;
        }
        return false;
    }
}

mortal.sol

pragma solidity ^0.4.24;


contract Mortal {
    address owner;
    
    constructor () public {
        owner= msg.sender;
    }
    
    function kill () public {
        if (msg.sender == owner)
            selfdestruct (owner);
    }
}