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-v0.5.2+commit.1df8f40c.js&optimize=false&gist=

ballot.sol

pragma solidity >=0.4.22 <0.6.0;
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.
    constructor(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 view 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;
            }
    }
}

ballot_test.sol

import "remix_tests.sol"; // this import is automatically injected by Remix.
import "./ballot.sol";

contract test3 {
   
    Ballot ballotToTest;
    function beforeAll () public {
       ballotToTest = new Ballot(2);
    }
    
    function checkWinningProposal () public {
        ballotToTest.vote(1);
        Assert.equal(ballotToTest.winningProposal(), uint(1), "1 should be the winning proposal");
    }
    
    function checkWinninProposalWithReturnValue () public view returns (bool) {
        return ballotToTest.winningProposal() == 1;
    }
}

SarwarToken.sol

pragma solidity >=0.4.22 <0.6.0;

import "https://raw.githubusercontent.com/OpenZeppelin/openzeppelin-solidity/release-v2.1.0/contracts/ownership/Ownable.sol";

contract SarwarCoin is Ownable {
    address private _owner;
    string symbol;
    string name;
    uint totalCoins;

    mapping(address => uint) balances;
    


    constructor(uint total) public {

        totalCoins = total;
        balances[msg.sender] = total;
    } 
    
    function totalSupply() view public returns (uint256 ) {
        return totalCoins;
    }
    
    function balanceOf(address _addressOwner) view public returns (uint256 ) {
        return balances[_addressOwner];
    }
    
    function transfer(address _to, uint256 _value) public returns (bool)  {
        if(balances[msg.sender] >= _value)
        {
            balances[_to] = balances[_to] + _value;
            balances[msg.sender] = balances[msg.sender] - _value;
            emit Transfer(msg.sender, _to, _value);
            return true;
        }
            return false;
    }

    event Transfer(address indexed _from, address indexed _to, uint256 _value);

}

Score.sol

pragma solidity >=0.4.22 <0.6.0;
contract Score {
    uint value;
    string description;
    address owner;
    
    modifier onlyOwner() {
        //globally available msg.sender checked against owner variable
        if(msg.sender==owner) {
            _; //this is where the function executes
        }
    }
    
    event ScoreSet(uint);
    
    constructor() public {
        owner = msg.sender;
    }
    
    function getScore() public view returns (uint) {
        //this is a comment
        return value;
    }
 
    function setScore(uint score) public onlyOwner() returns (uint) {
        value = score;
        emit ScoreSet(value);
        
        return score;
    }  
 
}