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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;
            }
    }
}

MyToken.sol

//contract FixedSupplyToken is ERC20Interface, Owned {
//https://ethernaut.zeppelin.solutions/
contract MyToken {
    
    uint totalTokens;
    uint tokenCost;
    mapping(address => uint) reserve;
    mapping(address => uint) balances;
    mapping(address => Account) accounts;
    
    struct Account {
        address addr;
        uint balance;
        uint timestamp;
    }
    
    function writeToObject() {
        accounts[msg.sender].addr = msg.sender;
        accounts[msg.sender].balance = 1;
        accounts[msg.sender].timestamp = now;
    }
    
    function readObject() view returns(uint myBalance, uint myTime) {
        return (accounts[msg.sender].balance, accounts[msg.sender].timestamp);
    }
    
    function MyToken(uint tokenCount, uint tokenPrice) {
        totalTokens = tokenCount;
        tokenCost = tokenPrice;
    }
    
    function buyToken() payable {
        uint desiredTokens = msg.value / tokenCost; 
        require(totalTokens <= desiredTokens);
        reserve[msg.sender] += desiredTokens;
    }
    
    function claim() {
        require(block.timestamp > 100);
        balances[msg.sender] = reserve[msg.sender];
    }
    
    function transfer(address toAddr, uint value) {
        require(value > 0);
        require(balances[msg.sender] >= value);
        balances[msg.sender] -= value;
        balances[toAddr] += value;
    }
    
    function getBalance() view returns(uint) {
        return balances[msg.sender];
    }
}

Wallet.sol

contract Wallet {
    address owner;
    address approver;
    uint amountToWithdrawal;
    
    function Wallet(address app) {
        owner = msg.sender;
        approver = app;
    }
    
    function deposit() payable public{
        
    }
    
    modifier isOwner() {
        require(msg.sender == owner);
        _;
    }
    
    modifier isApprover() {
        require(msg.sender == approver);
        _;
    }
    
    function withdrawal() isOwner public{
        amountToWithdrawal = this.balance;
        //owner.transfer(this.balance);
    }
    
    function approve() isApprover public {
        owner.transfer(amountToWithdrawal);
        amountToWithdrawal = 0;
    }
    
    
    // function withdrawal()  public{
    //     if( owner == msg.sender) {
    //         owner.transfer(this.balance);
    //     }
    // }
     
    function checkBalance() view returns(uint) { 
        return this.balance;
    }
    
    function() payable{
        
    }
}