contract ESOSToken is ERC20Interface {

    string public constant symbol = "ESOS";
    string public constant name = "Eso Token";
    uint8 public constant decimals = 18;
    uint256 _totalSupply = 70000000 * 10 ** uint256(decimals);
    
    address public owner;

    mapping(address => uint256) balances;
 
    mapping(address => mapping (address => uint256)) allowed;

    //constructor
    constructor() public {
        owner = msg.sender;
        balances[owner] = _totalSupply;
    }

    // Handle ether mistakenly sent to contract
    function () public payable {
      if (msg.value > 0) {
          if (!owner.send(msg.value)) revert();
      }
    }

    // Get the total token supply
    function totalSupply() public constant returns (uint256 tS) {
        tS = _totalSupply;
    }
 
    // What is the balance of a particular account?
    function balanceOf(address _owner) public constant returns (uint256 balance) {
        return balances[_owner];
    }
 
    // Transfer the balance from owner's account to another account
    function transfer(address _to, uint256 _amount) public returns (bool success) {
        if (balances[msg.sender] >= _amount 
            && _amount > 0
            && balances[_to] + _amount > balances[_to]) {
            balances[msg.sender] -= _amount;
            balances[_to] += _amount;
            emit Transfer(msg.sender, _to, _amount);
            return true;
        } else {
            return false;
        }
    }
 
    // Send _value amount of tokens from address _from to address _to
    // The transferFrom method is used for a withdraw workflow, allowing contracts to send
    // tokens on your behalf, for example to "deposit" to a contract address and/or to charge
    // fees in sub-currencies; the command should fail unless the _from account has
    // deliberately authorized the sender of the message via some mechanism; we propose
    // these standardized APIs for approval:
    function transferFrom(address _from, address _to, uint256 _amount) public returns (bool success) {
        if (balances[_from] >= _amount
            && allowed[_from][msg.sender] >= _amount
            && _amount > 0
            && balances[_to] + _amount > balances[_to]) {
            balances[_from] -= _amount;
            allowed[_from][msg.sender] -= _amount;
            balances[_to] += _amount;
            emit Transfer(_from, _to, _amount);
            return true;
        } else {
            return false;
        }
    }
 
    // Allow _spender to withdraw from your account, multiple times, up to the _value amount.
    // If this function is called again it overwrites the current allowance with _value.
    function approve(address _spender, uint256 _amount) public returns (bool success) {
        allowed[msg.sender][_spender] = _amount;
        emit Approval(msg.sender, _spender, _amount);
        return true;
    }
 
    function allowance(address _owner, address _spender) public constant returns (uint256 remaining) {
        return allowed[_owner][_spender];
    }

    // Used for burning excess tokens after ICO.
    function burnExcess(uint256 _value) public returns (bool success) {
        require(balanceOf(msg.sender) >= _value && msg.sender == owner && _value > 0);
        balances[msg.sender] -= _value;
        _totalSupply -= _value;
        emit Burn(msg.sender, _value);
        return true;
    }

    // Transfer the balance from owner's account to another account plus a fee to the contract owner owner
    function transferWithFee(address _to, uint256 _amount, uint256 _fee) public returns (bool success) {
        if (balances[msg.sender] >= _amount + _fee
            && _amount > 0
            && _fee > 0
            && balances[_to] + _amount > balances[_to]) {
            balances[msg.sender] -= _amount + _fee;
            balances[_to] += _amount;
            balances[owner] += _fee;
            emit TransferWithFee(msg.sender, _to, _amount, _fee);
            return true;
        } else {
            return false;
        }
    }
}
function balanceOf(address _owner) public constant returns (uint256 balance) {
        return balances[_owner];
    }
// What is the balance of a particular account?