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FundRaising.sol

pragma solidity ^ 0.4.25;

contract FundRaising {
    
    mapping(address=>uint) public contributions;
    uint public totalContributors;
    uint public minimumContribution;
    uint public deadline;
    uint public goal;
    uint public raisedAmount = 0 ;
    address public admin;
    
    struct  Request  {
        string description;
        uint value;
        address recipient;
        bool completed;
        uint numberOfVoters;
        mapping(address=>bool) voters;
    }
    Request[] public requests;
    
    constructor(uint _deadline,uint _goal) public{
        minimumContribution = 1000000;
        deadline=block.number + _deadline;
        goal=_goal;
        admin = msg.sender;
    }
    
    modifier onlyAdmin {
        require(msg.sender == admin);
        _;
    }
    
    
    function contribute() public payable {
        require(msg.value > minimumContribution,"the minimum contribution should be 1000000");
        require(block.number < deadline);
        
        if(contributions[msg.sender] == 0)
        {
            totalContributors++;
        }
        
        contributions[msg.sender] += msg.value;
        raisedAmount+=msg.value;
    }
    
    function getBalance() public view returns(uint)
    {
        return address(this).balance;
    }
    
    function getRefund() public {
        require(block.number > deadline);
        require(raisedAmount < goal);
        require(contributions[msg.sender] > 0);
        
        
        msg.sender.transfer(contributions[msg.sender]);
        contributions[msg.sender] = 0;
       
    }
    
    function createSpendingRequest(string _description, address _recipient, uint _value) public onlyAdmin{
        
        Request memory newRequest = Request(
            {
                description:_description,
                value:_value,
                recipient:_recipient,
                numberOfVoters:0,
                completed:false
                }
            );
        
        requests.push(newRequest);
        
        
    }
    
    function voteForRequest(uint index) public {
        Request storage thisRequest = requests[index];
        require(contributions[msg.sender] > 0);
        require(thisRequest.voters[msg.sender] == false);
        
        thisRequest.voters[msg.sender] = true;
        thisRequest.numberOfVoters++;
    }
    
    function makePayment(uint index) public onlyAdmin {
        Request storage thisRequest = requests[index];
        require(thisRequest.completed == false);
         require(thisRequest.numberOfVoters > totalContributors / 2);//more than 50% voted
        thisRequest.recipient.transfer(thisRequest.value);
        thisRequest.completed = true;
    }
}