contract TKF is owned, TokenERC20 {

    mapping (address => bool) public frozenAccount;

    /* This generates a public event on the blockchain that will notify clients */
    event FrozenFunds(address target, bool frozen);

    /* Initializes contract with initial supply tokens to the creator of the contract */
    constructor(
        uint256 initialSupply,
        string tokenName,
        string tokenSymbol
    ) TokenERC20(initialSupply, tokenName, tokenSymbol) public {}

    /* Internal transfer, only can be called by this contract */
    function _transfer(address _from, address _to, uint _value) internal {
        require (_to != 0x0);                                              // Prevent transfer to 0x0 address. Use burn() instead
        require (balanceOf[_from] >= _value);                              // Check if the sender has enough
        require (balanceOf[_to] + _value > balanceOf[_to]);                // Check for overflows
        require(!frozenAccount[_from]);                                    // Check if sender is frozen
        require(!frozenAccount[_to]);                                      // Check if recipient is frozen
        balanceOf[_from] = SafeMath.sub(balanceOf[_from],_value);          // Subtract from the sender
        balanceOf[_to] = SafeMath.add(balanceOf[_to],_value);              // Add the same to the recipient
        emit Transfer(_from, _to, _value);
    }

    function mintToken(address target, uint256 mintedAmount) onlyOwner public {
        balanceOf[target] = SafeMath.add(balanceOf[target],mintedAmount);
        totalSupply = SafeMath.add(totalSupply,mintedAmount); 
        emit Transfer(0, this, mintedAmount);
        emit Transfer(this, target, mintedAmount);
    }

    function freezeAccount(address target, bool freeze) onlyOwner public {
        frozenAccount[target] = freeze;
        emit FrozenFunds(target, freeze);
    }

}
function _transfer(address _from, address _to, uint _value) internal {
    require (_to != 0x0);                                              // Prevent transfer to 0x0 address. Use burn() instead
    require (balanceOf[_from] >= _value);                              // Check if the sender has enough
    require (balanceOf[_to] + _value > balanceOf[_to]);                // Check for overflows
    require(!frozenAccount[_from]);                                    // Check if sender is frozen
    require(!frozenAccount[_to]);                                      // Check if recipient is frozen
    balanceOf[_from] = SafeMath.sub(balanceOf[_from],_value);          // Subtract from the sender
    balanceOf[_to] = SafeMath.add(balanceOf[_to],_value);              // Add the same to the recipient
    emit Transfer(_from, _to, _value);
}

/* Internal transfer, only can be called by this contract */