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1_Storage.sol

pragma solidity >=0.4.22 <0.7.0;

/**
 * @title Storage
 * @dev Store & retreive value in a variable
 */
contract Storage {

    uint256 number;

    /**
     * @dev Store value in variable
     * @param num value to store
     */
    function store(uint256 num) public {
        number = num;
    }

    /**
     * @dev Return value 
     * @return value of 'number'
     */
    function retreive() public view returns (uint256){
        return number;
    }
}

2_Owner.sol

pragma solidity >=0.4.22 <0.7.0;

/**
 * @title Owner
 * @dev Set & change owner
 */
contract Owner {

    address private owner;
    
    // event for EVM logging
    event OwnerSet(address indexed oldOwner, address indexed newOwner);
    
    // modifier to check if caller is owner
    modifier isOwner() {
        // If the first argument of 'require' evaluates to 'false', execution terminates and all
        // changes to the state and to Ether balances are reverted.
        // This used to consume all gas in old EVM versions, but not anymore.
        // It is often a good idea to use 'require' to check if functions are called correctly.
        // As a second argument, you can also provide an explanation about what went wrong.
        require(msg.sender == owner, "Caller is not owner");
        _;
    }
    
    /**
     * @dev Set contract deployer as owner
     */
    constructor() public {
        owner = msg.sender; // 'msg.sender' is sender of current call, contract deployer for a constructor
        emit OwnerSet(address(0), owner);
    }

    /**
     * @dev Change owner
     * @param newOwner address of new owner
     */
    function changeOwner(address newOwner) public isOwner {
        emit OwnerSet(owner, newOwner);
        owner = newOwner;
    }

    /**
     * @dev Return owner address 
     * @return address of owner
     */
    function getOwner() external view returns (address) {
        return owner;
    }
}

3_Ballot.sol

pragma solidity >=0.4.22 <0.7.0;

/** 
 * @title Ballot
 * @dev Implements voting process along with vote delegation
 */
contract Ballot {
   
    struct Voter {
        uint weight; // weight is accumulated by delegation
        bool voted;  // if true, that person already voted
        address delegate; // person delegated to
        uint vote;   // index of the voted proposal
    }

    struct Proposal {
        // If you can limit the length to a certain number of bytes, 
        // always use one of bytes1 to bytes32 because they are much cheaper
        bytes32 name;   // short name (up to 32 bytes)
        uint voteCount; // number of accumulated votes
    }

    address public chairperson;

    mapping(address => Voter) public voters;

    Proposal[] public proposals;

    /** 
     * @dev Create a new ballot to choose one of 'proposalNames'.
     * @param proposalNames names of proposals
     */
    constructor(bytes32[] memory proposalNames) public {
        chairperson = msg.sender;
        voters[chairperson].weight = 1;

        for (uint i = 0; i < proposalNames.length; i++) {
            // 'Proposal({...})' creates a temporary
            // Proposal object and 'proposals.push(...)'
            // appends it to the end of 'proposals'.
            proposals.push(Proposal({
                name: proposalNames[i],
                voteCount: 0
            }));
        }
    }
    
    /** 
     * @dev Give 'voter' the right to vote on this ballot. May only be called by 'chairperson'.
     * @param voter address of voter
     */
    function giveRightToVote(address voter) public {
        require(
            msg.sender == chairperson,
            "Only chairperson can give right to vote."
        );
        require(
            !voters[voter].voted,
            "The voter already voted."
        );
        require(voters[voter].weight == 0);
        voters[voter].weight = 1;
    }

    /**
     * @dev Delegate your vote to the voter 'to'.
     * @param to address to which vote is delegated
     */
    function delegate(address to) public {
        Voter storage sender = voters[msg.sender];
        require(!sender.voted, "You already voted.");
        require(to != msg.sender, "Self-delegation is disallowed.");

        while (voters[to].delegate != address(0)) {
            to = voters[to].delegate;

            // We found a loop in the delegation, not allowed.
            require(to != msg.sender, "Found loop in delegation.");
        }
        sender.voted = true;
        sender.delegate = to;
        Voter storage delegate_ = voters[to];
        if (delegate_.voted) {
            // If the delegate already voted,
            // directly add to the number of votes
            proposals[delegate_.vote].voteCount += sender.weight;
        } else {
            // If the delegate did not vote yet,
            // add to her weight.
            delegate_.weight += sender.weight;
        }
    }

    /**
     * @dev Give your vote (including votes delegated to you) to proposal 'proposals[proposal].name'.
     * @param proposal index of proposal in the proposals array
     */
    function vote(uint proposal) public {
        Voter storage sender = voters[msg.sender];
        require(sender.weight != 0, "Has no right to vote");
        require(!sender.voted, "Already voted.");
        sender.voted = true;
        sender.vote = proposal;

        // If 'proposal' is out of the range of the array,
        // this will throw automatically and revert all
        // changes.
        proposals[proposal].voteCount += sender.weight;
    }

    /** 
     * @dev Computes the winning proposal taking all previous votes into account.
     * @return winningProposal_ index of winning proposal in the proposals array
     */
    function winningProposal() public view
            returns (uint winningProposal_)
    {
        uint winningVoteCount = 0;
        for (uint p = 0; p < proposals.length; p++) {
            if (proposals[p].voteCount > winningVoteCount) {
                winningVoteCount = proposals[p].voteCount;
                winningProposal_ = p;
            }
        }
    }

    /** 
     * @dev Calls winningProposal() function to get the index of the winner contained in the proposals array and then
     * @return winnerName_ the name of the winner
     */
    function winnerName() public view
            returns (bytes32 winnerName_)
    {
        winnerName_ = proposals[winningProposal()].name;
    }
}

AOOODataCoin.sol

pragma solidity ^0.4.4;
contract Token {
/// @return total amount of tokens
 function totalSupply() constant returns (uint256 supply) {}
/// @param _owner The address from which the balance will be retrieved
 /// @return The balance
 function balanceOf(address _owner) constant returns (uint256 balance) {}
/// @notice send `_value` token to `_to` from `msg.sender`
 /// @param _to The address of the recipient
 /// @param _value The amount of token to be transferred
 /// @return Whether the transfer was successful or not
 function transfer(address _to, uint256 _value) returns (bool success) {}
/// @notice send `_value` token to `_to` from `_from` on the condition it is approved by `_from`
 /// @param _from The address of the sender
 /// @param _to The address of the recipient
 /// @param _value The amount of token to be transferred
 /// @return Whether the transfer was successful or not
 function transferFrom(address _from, address _to, uint256 _value) returns (bool success) {}
/// @notice `msg.sender` approves `_addr` to spend `_value` tokens
 /// @param _spender The address of the account able to transfer the tokens
 /// @param _value The amount of wei to be approved for transfer
 /// @return Whether the approval was successful or not
 function approve(address _spender, uint256 _value) returns (bool success) {}
/// @param _owner The address of the account owning tokens
 /// @param _spender The address of the account able to transfer the tokens
 /// @return Amount of remaining tokens allowed to spent
 function allowance(address _owner, address _spender) constant returns (uint256 remaining) {}
event Transfer(address indexed _from, address indexed _to, uint256 _value);
 event Approval(address indexed _owner, address indexed _spender, uint256 _value);
 
}
contract StandardToken is Token {
function transfer(address _to, uint256 _value) returns (bool success) {
 //Default assumes totalSupply can’t be over max (2²⁵⁶ — 1).
 //If your token leaves out totalSupply and can issue more tokens as time goes on, you need to check if it doesn’t wrap.
 //Replace the if with this one instead.
 //if (balances[msg.sender] >= _value && balances[_to] + _value > balances[_to]) {
 if (balances[msg.sender] >= _value && _value > 0) {
 balances[msg.sender] -= _value;
 balances[_to] += _value;
 Transfer(msg.sender, _to, _value);
 return true;
 } else { return false; }
 }
function transferFrom(address _from, address _to, uint256 _value) returns (bool success) {
 //same as above. Replace this line with the following if you want to protect against wrapping uints.
 //if (balances[_from] >= _value && allowed[_from][msg.sender] >= _value && balances[_to] + _value > balances[_to]) {
 if (balances[_from] >= _value && allowed[_from][msg.sender] >= _value && _value > 0) {
 balances[_to] += _value;
 balances[_from] -= _value;
 allowed[_from][msg.sender] -= _value;
 Transfer(_from, _to, _value);
 return true;
 } else { return false; }
 }
function balanceOf(address _owner) constant returns (uint256 balance) {
 return balances[_owner];
 }
function approve(address _spender, uint256 _value) returns (bool success) {
 allowed[msg.sender][_spender] = _value;
 Approval(msg.sender, _spender, _value);
 return true;
 }
function allowance(address _owner, address _spender) constant returns (uint256 remaining) {
 return allowed[_owner][_spender];
 }
mapping (address => uint256) balances;
 mapping (address => mapping (address => uint256)) allowed;
 uint256 public totalSupply;
}

//name this contract whatever you’d like
contract ERC20Token is StandardToken {
function () {
 //if ether is sent to this address, send it back.
 throw;
 }
/* Public variables of the token */
/*
 NOTE:
 The following variables are OPTIONAL vanities. One does not have to include them.
 They allow one to customise the token contract & in no way influences the core functionality.
 Some wallets/interfaces might not even bother to look at this information.
 */
 string public name; //fancy name: eg Simon Bucks
 uint8 public decimals; //How many decimals to show. ie. There could 1000 base units with 3 decimals. Meaning 0.980 SBX = 980 base units. It’s like comparing 1 wei to 1 ether.
 string public symbol; //An identifier: eg SBX
 string public version = "H1.0"; //human 0.1 standard. Just an arbitrary versioning scheme.
//
// CHANGE THESE VALUES FOR YOUR TOKEN
//
//make sure this function name matches the contract name above. So if you’re token is called TutorialToken, make sure the //contract name above is also TutorialToken instead of ERC20Token
function ERC20Token() {
  balances[msg.sender] = 1000000; // Give the creator all initial tokens (100000 for example)
 totalSupply = 1000000; // Update total supply (100000 for example)
 name = "AOOO DATA COIN"; // Set the name for display purposes
 decimals = 1; // Amount of decimals for display purposes
 symbol = "ADCT"; // Set the symbol for display purposes
 }
 
/* Approves and then calls the receiving contract */
 function approveAndCall(address _spender, uint256 _value, bytes _extraData) returns (bool success) {
 allowed[msg.sender][_spender] = _value;
 Approval(msg.sender, _spender, _value);
//call the receiveApproval function on the contract you want to be notified. This crafts the function signature manually so one doesn’t have to include a contract in here just for this.
 //receiveApproval(address _from, uint256 _value, address _tokenContract, bytes _extraData)
 //it is assumed that when does this that the call *should* succeed, otherwise one would use vanilla approve instead.
 if(!_spender.call(bytes4(bytes32(sha3("receiveApproval(address,uint256,address,bytes)"))), msg.sender, _value, this, _extraData)) { throw; }
 return true;
 }
}

Bounties.sol

pragma solidity ^0.5.0;

contract Bounties {

    constructor() public {
        
    }

    
}

TestAOOODataCoin.sol

pragma solidity ^0.4.4;
contract Token {
 /// @return total amount of tokens
 function totalSupply() constant returns (uint256 supply) {}
/// @param _owner The address from which the balance will be retrieved
 /// @return The balance
 function balanceOf(address _owner) constant returns (uint256 balance) {}
/// @notice send `_value` token to `_to` from `msg.sender`
 /// @param _to The address of the recipient
 /// @param _value The amount of token to be transferred
 /// @return Whether the transfer was successful or not
 function transfer(address _to, uint256 _value) returns (bool success) {}
/// @notice send `_value` token to `_to` from `_from` on the condition it is approved by `_from`
 /// @param _from The address of the sender
 /// @param _to The address of the recipient
 /// @param _value The amount of token to be transferred
 /// @return Whether the transfer was successful or not
 function transferFrom(address _from, address _to, uint256 _value) returns (bool success) {}
/// @notice `msg.sender` approves `_addr` to spend `_value` tokens
 /// @param _spender The address of the account able to transfer the tokens
 /// @param _value The amount of wei to be approved for transfer
 /// @return Whether the approval was successful or not
 function approve(address _spender, uint256 _value) returns (bool success) {}
/// @param _owner The address of the account owning tokens
 /// @param _spender The address of the account able to transfer the tokens
 /// @return Amount of remaining tokens allowed to spent
 function allowance(address _owner, address _spender) constant returns (uint256 remaining) {}
event Transfer(address indexed _from, address indexed _to, uint256 _value);
 event Approval(address indexed _owner, address indexed _spender, uint256 _value);
}
contract StandardToken is Token {
function transfer(address _to, uint256 _value) returns (bool success) {
 //Default assumes totalSupply can’t be over max (2²⁵⁶ — 1).
 //If your token leaves out totalSupply and can issue more tokens as time goes on, you need to check if it doesn’t wrap.
 //Replace the if with this one instead.
 //if (balances[msg.sender] >= _value && balances[_to] + _value > balances[_to]) {
 if (balances[msg.sender] >= _value && _value > 0) {
 balances[msg.sender] -= _value;
 balances[_to] += _value;
 Transfer(msg.sender, _to, _value);
 return true;
 } else { return false; }
 }
function transferFrom(address _from, address _to, uint256 _value) returns (bool success) {
 //same as above. Replace this line with the following if you want to protect against wrapping uints.
 //if (balances[_from] >= _value && allowed[_from][msg.sender] >= _value && balances[_to] + _value > balances[_to]) {
 if (balances[_from] >= _value && allowed[_from][msg.sender] >= _value && _value > 0) {
 balances[_to] += _value;
 balances[_from] -= _value;
 allowed[_from][msg.sender] -= _value;
 Transfer(_from, _to, _value);
 return true;
 } else { return false; }
 }
function balanceOf(address _owner) constant returns (uint256 balance) {
 return balances[_owner];
 }
function approve(address _spender, uint256 _value) returns (bool success) {
 allowed[msg.sender][_spender] = _value;
 Approval(msg.sender, _spender, _value);
 return true;
 }
function allowance(address _owner, address _spender) constant returns (uint256 remaining) {
 return allowed[_owner][_spender];
 }
mapping (address => uint256) balances;
 mapping (address => mapping (address => uint256)) allowed;
 uint256 public totalSupply;
}
contract ERC20Token is StandardToken {
function () {
 //if ether is sent to this address, send it back.
 throw;
 }
/* Public variables of the token */
 string public name = 'AOOO DATA COIN'; //Name of the token
 uint8 public decimals = 3; //How many decimals to show. ie. There could 1000 base units with 3 decimals
 string public symbol = 'ADC'; //An identifier: eg AXM
 string public version = 'H1.0'; //human 0.1 standard. Just an arbitrary versioning scheme.
//
// CHANGE THE FOLLOWING VALUES FOR YOUR TOKEN!
//
//make sure this function name matches the contract name above. So if you’re token is called TutorialToken, make sure the //contract name above is also TutorialToken instead of ERC20Token
function ERC20Token(
 ) {
 balances[msg.sender] = 1000000; // Give the creator all initial tokens (100000 for example)
 totalSupply = 1000000; // Update total supply (100000 for example)
 name = 'AOOO DATA COIN'; // Set the name for display purposes
 decimals = 3; // Amount of decimals
 symbol = 'ADC'; // Set the symbol for display purposes
 }
/* Approves and then calls the receiving contract */
 function approveAndCall(address _spender, uint256 _value, bytes _extraData) returns (bool success) {
 allowed[msg.sender][_spender] = _value;
 Approval(msg.sender, _spender, _value);
//call the receiveApproval function on the contract you want to be notified. This crafts the function signature manually so one doesn’t have to include a contract in here just for this.
 //receiveApproval(address _from, uint256 _value, address _tokenContract, bytes _extraData)
 //it is assumed that when does this that the call *should* succeed, otherwise one would use vanilla approve instead.
 if(!_spender.call(bytes4(bytes32(sha3('receiveApproval(address,uint256,address,bytes)'))), msg.sender, _value, this, _extraData)) { throw; }
 return true;
 }
}