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contracts...campain.sol

//SPDX-License-Identifier: MIT

pragma solidity ^0.4.17;

contract Campaign{
    struct Request{
        string description;
        uint value;
        address recipient;
        bool complete;
    }
    Request[] public requests;

    address public manager;
    uint public minimumcontribute;
    address[] public approval;

    modifier restricted(){
        require(msg.sender == manager);
        _;
    }



    constructor(uint min) public {
        manager = msg.sender;
        minimumcontribute = min; 
    }

    function contribute() public payable{
        require(msg.value > minimumcontribute);
        approval.push(msg.sender);

    }
}