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ballot.sol

pragma solidity ^0.4.0;
contract Ballot {

    struct Voter {
        uint weight;
        bool voted;
        uint8 vote;
        address delegate;
    }
    struct Proposal {
        uint voteCount;
    }

    address chairperson;
    mapping(address => Voter) voters;
    Proposal[] proposals;

    /// Create a new ballot with $(_numProposals) different proposals.
    function Ballot(uint8 _numProposals) public {
        chairperson = msg.sender;
        voters[chairperson].weight = 1;
        proposals.length = _numProposals;
    }

    /// Give $(toVoter) the right to vote on this ballot.
    /// May only be called by $(chairperson).
    function giveRightToVote(address toVoter) public {
        if (msg.sender != chairperson || voters[toVoter].voted) return;
        voters[toVoter].weight = 1;
    }

    /// Delegate your vote to the voter $(to).
    function delegate(address to) public {
        Voter storage sender = voters[msg.sender]; // assigns reference
        if (sender.voted) return;
        while (voters[to].delegate != address(0) && voters[to].delegate != msg.sender)
            to = voters[to].delegate;
        if (to == msg.sender) return;
        sender.voted = true;
        sender.delegate = to;
        Voter storage delegateTo = voters[to];
        if (delegateTo.voted)
            proposals[delegateTo.vote].voteCount += sender.weight;
        else
            delegateTo.weight += sender.weight;
    }

    /// Give a single vote to proposal $(toProposal).
    function vote(uint8 toProposal) public {
        Voter storage sender = voters[msg.sender];
        if (sender.voted || toProposal >= proposals.length) return;
        sender.voted = true;
        sender.vote = toProposal;
        proposals[toProposal].voteCount += sender.weight;
    }

    function winningProposal() public constant returns (uint8 _winningProposal) {
        uint256 winningVoteCount = 0;
        for (uint8 prop = 0; prop < proposals.length; prop++)
            if (proposals[prop].voteCount > winningVoteCount) {
                winningVoteCount = proposals[prop].voteCount;
                _winningProposal = prop;
            }
    }
}

myfirstcontract.sol

pragma solidity ^0.4.0;

contract MyfirstContract{
    string private name;
    uint private age;
    
    function setName(string newName){
        name = newName;
    }
    function getName() returns(string){
        return name;
    }
}

youtube.sol

pragma solidity ^0.4.21;
import "github.com/oraclize/ethereum-api/oraclizeAPI.sol";


contract AdPerformance{
    address owner;
    address beneficiary;
    uint gweiToPayPerView;
    string youtubeId;
    bool withdrawn;
    
    
    
    function AdPerformance(address _benficiary, uint _gweiToPayPerView, string _youtubeId) public payable{
        owner = msg.sender;
        beneficiary = _benficiary;
        gweiToPayPerView = _gweiToPayPerView;
        youtubeId = _youtubeId;
        withdrawn = false;
    }
    
    function withdraw() public{
        require(msg.sender == beneficiary);
        require(!withdrawn);
        
        string memory query = strConcat('json(https://www.googleapis.com/youtube/v3/videos?id=',
                youtubeId,
                '&key=AIzaSyAhV6cw7pjvrrBoSkIDxff4gvovbF_9rXk%20&part=statistics).items.0.statistics.viewCount');
        oraclize_query('URL', query);
    }
    
    function __callback(bytes32, string result) public{
        require(msg.sender == oraclize_cbAddress());
        require(!withdrawn);
        
        uint viewCount = stringToUint(result);
        uint amount = viewCount * gweiToPayPerView * 1000000000;
        uint balance = address(this).balance;   
        
        if (balance < amount){
            amount = balance;
        }
        
        beneficiary.transfer(amount);
        withdrawn = true;
    }
    
    function isWithdrawn() public view returns (bool){
        return withdrawn;
    }
        
    function refund() public{
        require(msg.sender == owner);
        require(withdrawn);
        
        uint balance = address(this).balance;
        if (balance > 0){
            owner.transfer(balance);
        }
    }
    }