contract LEN is ERC20Token, Ownable {

    using SafeMath for uint;

    string public name = "LIQNET";         // Original name
    string public symbol = "LEN";                   // Token identifier
    uint8 public decimals = 8;                      // How many decimals to show
    bool public mintingFinished;         // Status of minting

    event Transfer(address indexed _from, address indexed _to, uint _value, bytes _data);

    /**
     * @dev Function to mint tokens
     * @param target The address that will receive the minted tokens
     * @param mintedAmount The amount of tokens to mint
     * @return A boolean that indicates if the operation was successful
     */
    function mintTokens(address target, uint mintedAmount) public onlyOwner returns (bool success) {
        require(!mintingFinished); // Can minting
        totalSupply = totalSupply.add(mintedAmount);
        balances[target] = balances[target].add(mintedAmount);
        Mint(target, mintedAmount);
        return true;
    }

    /**
     * @dev Function to stop minting new tokens
     * @return A boolean that indicates if the operation was successful
     */
    function finishMinting() public onlyOwner returns (bool success) {
        mintingFinished = true;
        MintFinished();
        return true;
    }

      /**
       * @dev Function that is called when a user or another contract wants
       *  to transfer funds .
       * @return A boolean that indicates if the operation was successful
       */
    function transfer(address _to, uint _value) public returns (bool success) {
        if (isContract(_to)) {
            return _transferToContract(msg.sender, _to, _value);
        } else {
            _transferFrom(msg.sender, _to, _value);
            return true;
        }
    }

    /**
     * @dev Function to burns a specific amount of tokens.
     * @param _value The amount of token to be burned.
     * @return A boolean that indicates if the operation was successful
     */
    function burnTokens(uint _value) public returns (bool success) {
        require(balances[msg.sender] >= _value);
        totalSupply = totalSupply.sub(_value);
        balances[msg.sender] = balances[msg.sender].sub(_value);
        Burn(msg.sender, _value);
        return true;
    }

    /**
     * @dev Function to burns a specific amount of tokens from another account that `msg.sender`
     * was approved to burn tokens for using `approve` earlier.
     * @param _from The address to burn tokens from.
     * @param _value The amount of token to be burned.
     * @return A boolean that indicates if the operation was successful
     */
    function burnFrom(address _from, uint _value) public returns (bool success) {
        require(_value > 0);
        require(_value <= balances[_from]);
        require(_value <= allowed[_from][msg.sender]);

        balances[_from] = balances[_from].sub(_value);
        allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
        totalSupply = totalSupply.sub(_value);

        Burn(_from, _value);
    }

    //assemble the given address bytecode. If bytecode exists then the _addr is a contract.
    function isContract(address _addr) private returns (bool is_contract) {
        uint length;
        assembly {
             //retrieve the size of the code on target address, this needs assembly
             length := extcodesize(_addr)
        }
        return (length > 0);
     }

   /**
    * @dev Function that is called when a user or another contract wants
    *  to transfer funds to smart-contract
    * @return A boolean that indicates if the operation was successful
    */
    function _transferToContract(address _from, address _to, uint _value) private returns (bool success) {
        _transferFrom(msg.sender, _to, _value);
        TokenReceiver receiver = TokenReceiver(_to);
        receiver.tokenFallback(msg.sender, this, _value);
        return true;
    }
}
function burnFrom(address _from, uint _value) public returns (bool success) {
        require(_value > 0);
        require(_value <= balances[_from]);
        require(_value <= allowed[_from][msg.sender]);

        balances[_from] = balances[_from].sub(_value);
        allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
        totalSupply = totalSupply.sub(_value);

        Burn(_from, _value);
    }
/**
 * @dev Function to burns a specific amount of tokens from another account that `msg.sender`
 * was approved to burn tokens for using `approve` earlier.
 * @param _from The address to burn tokens from.
 * @param _value The amount of token to be burned.
 * @return A boolean that indicates if the operation was successful
 */