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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;
            }
    }
}

Nero.sol

pragma solidity ^0.4.24;

contract MemphisContract {
    
    string public name = "Memphis";
    string public symbol = "MEM";
    // it's design how many times can i divide 1 token
    uint8 public decimals = 18;
    uint public totalSupply;
    uint public MemphisSupply = 5000000000;
    uint public buyPrice = 19555555;
    // creator will be the address of the contract's creator 
    address public creator;
    
    // This creates an array with all balances
    mapping (address => uint256) public balanceOf;

    // This generates a public event on the blockchain that will notify clients
    event Transfer(address indexed from, address indexed to, uint256 value);
    event FundTransfer(address backer, uint amount, bool isContribution);
    
    
    /**
     * Constrctor function
     * Initializes contract with initial supply tokens to the creator of the contract
     */
    constructor() public {
        /*
         *  We have 18 like deciamls so we must have (18 ^ 10) * MemphisSupply
         *  Update total supply with the decimal amount
        */
        totalSupply = MemphisSupply * 10 ** uint256(decimals); 
        balanceOf[msg.sender] = totalSupply;    // Give NeroCoin Mint the total created tokens
        creator = msg.sender;
    }
    
    /**
     * Internal transfer, only can be called by this contract
     */
    function _transfer(address _from, address _to, uint _value) internal {
        // Prevent transfer to 0x0 address. Use burn() instead
        require(_to != 0x0);
        // Check if the sender has enough
        require(balanceOf[_from] >= _value);
        // Check for overflows
        require(balanceOf[_to] + _value >= balanceOf[_to]);
        // Subtract from the sender
        balanceOf[_from] -= _value;
        // Add the same to the recipient
        balanceOf[_to] += _value;
        emit Transfer(_from, _to, _value);
    }

    /**
     * Transfer tokens
     *
     * Send `_value` tokens to `_to` from your account
     *
     * @param _to The address of the recipient
     * @param _value the amount to send
     */
    function transfer(address _to, uint256 _value) public {
        _transfer(msg.sender, _to, _value);
    }


    /*
    * This function is call when ether send to the contract
    *  @notice Buy tokens from contract by sending ether
    */
    uint public lastValue;
    function () payable internal {
        // The Memphis's token amount is calculate to be send to buyer
        lastValue = msg.value;
        uint amount = msg.value * buyPrice;                    
        // checks if it has enough to sell
        require(balanceOf[creator] >= amount);               
        balanceOf[msg.sender] += amount;                 
        balanceOf[creator] -= amount;                        
        emit Transfer(creator, msg.sender, amount);              
        creator.transfer(amount);
    }

 }