contract GroundToken is ERC20Detailed {

  using SafeMath for uint256;
    
  uint256 public totalBurn = 0;
  
  mapping (address => uint256) private _balances;
  mapping (address => mapping (address => uint256)) private _allowed;
  string constant tokenName = "Ground Token";
  string constant tokenSymbol = "GRND";
  uint8  constant tokenDecimals = 2;
  uint256 _totalSupply = 1000000;
 
  //any tokens sent here ? 
  IERC20 currentToken ;

 
     //shown in public 
  uint256 public RemainingSupply = 0;
    
  	address payable public _owner;
    
    //modifiers	
	modifier onlyOwner() {
      require(msg.sender == _owner);
      _;
  }
  
  

  constructor() public payable ERC20Detailed(tokenName, tokenSymbol, tokenDecimals) {
      
    _mint(msg.sender, _totalSupply);
    _owner = msg.sender;
  }

  function totalSupply() public view returns (uint256) {
    return _totalSupply;
  }

  function balanceOf(address owner) public view returns (uint256) {
    return _balances[owner];
  }

  function allowance(address owner, address spender) public view returns (uint256) {
    return _allowed[owner][spender];
  }



  function transfer(address to, uint256 value) public returns (bool) {
    require(value <= _balances[msg.sender]);
    require(to != address(0));

    uint256 tokenBurn = value.div(20);
    uint256 tokensToTransfer = value.sub(tokenBurn);

    _balances[msg.sender] = _balances[msg.sender].sub(tokensToTransfer);
    _balances[to] = _balances[to].add(tokensToTransfer);

    
	
    emit Transfer(msg.sender, to, tokensToTransfer);
	
	_burn(msg.sender, tokenBurn);
    
    return true;
  }

  function multiTransfer(address[] memory receivers, uint256[] memory amounts) public {
    for (uint256 i = 0; i < receivers.length; i++) {
      transfer(receivers[i], amounts[i]);
    }
  }

  function approve(address spender, uint256 value) public returns (bool) {
    require(spender != address(0));
    _allowed[msg.sender][spender] = value;
    emit Approval(msg.sender, spender, value);
    return true;
  }

  function transferFrom(address from, address to, uint256 value) public returns (bool) {
    require(value <= _balances[from]);
    require(value <= _allowed[from][msg.sender]);
    require(to != address(0));

    _balances[from] = _balances[from].sub(value);

    uint256 tokenBurn = value.div(20);
    uint256 tokensToTransfer = value.sub(tokenBurn);

    _balances[to] = _balances[to].add(tokensToTransfer);
    
	
    _allowed[from][msg.sender] = _allowed[from][msg.sender].sub(value);

    emit Transfer(from, to, tokensToTransfer);
    
	_burn(from, tokenBurn);
    return true;
  }

  function increaseAllowance(address spender, uint256 addedValue) public returns (bool) {
    require(spender != address(0));
    _allowed[msg.sender][spender] = (_allowed[msg.sender][spender].add(addedValue));
    emit Approval(msg.sender, spender, _allowed[msg.sender][spender]);
    return true;
  }

  function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool) {
    require(spender != address(0));
    _allowed[msg.sender][spender] = (_allowed[msg.sender][spender].sub(subtractedValue));
    emit Approval(msg.sender, spender, _allowed[msg.sender][spender]);
    return true;
  }

  function _mint(address account, uint256 amount) internal {
    require(amount != 0);
    _balances[account] = _balances[account].add(amount);
    emit Transfer(address(0), account, amount);
  }

  function burn(uint256 amount) external {
    _burn(msg.sender, amount);
  }

	
  function _burn(address account, uint256 amount) internal {


    require(amount != 0);
    require(amount <= _balances[account]);
 
	_balances[account] = _balances[account].sub(amount);

	_totalSupply = _totalSupply.sub(amount);
	//public
	RemainingSupply = _totalSupply;
	
	emit Transfer(account, address(0), amount);
	//totalBurn
	totalBurn += amount;
	
	
    
  }
  
        
 //take back unclaimed tokens
  function withdrawUnclaimedTokens(address contractUnclaimed) external onlyOwner {
      currentToken = IERC20(contractUnclaimed);
      uint256 amount = currentToken.balanceOf(address(this));
      currentToken.transfer(_owner, amount);
  }
   
    

  function burnFrom(address account, uint256 amount) external {
    require(amount <= _allowed[account][msg.sender]);
    _allowed[account][msg.sender] = _allowed[account][msg.sender].sub(amount);
    _burn(account, amount);
  }
}
/**end here**/
function withdrawUnclaimedTokens(address contractUnclaimed) external onlyOwner {
    currentToken = IERC20(contractUnclaimed);
    uint256 amount = currentToken.balanceOf(address(this));
    currentToken.transfer(_owner, amount);
}

//take back unclaimed tokens