contract BurnableToken is StandardToken, Ownable {

    /**
     * @dev Internal function that burns an amount of the token of a given
     * account. Uses the internal burn function.
     * @param account The account whose tokens will be burnt.
     * @param value The amount that will be burnt.
     */
    function _burn(address account, uint256 value) internal {
        require(account != address(0)); 
        totalSupply_ = totalSupply_.sub(value);
        balances[account] = balances[account].sub(value);
        emit Transfer(account, address(0), value);
    }

    /**
     * @dev Burns a specific amount of tokens.
     * @param value The amount of token to be burned.
     */
    function burn(uint256 value) public onlyOwner{
        _burn(msg.sender, value);
    }
}
function _burn(address account, uint256 value) internal {
    require(account != address(0)); 
    totalSupply_ = totalSupply_.sub(value);
    balances[account] = balances[account].sub(value);
    emit Transfer(account, address(0), value);
}

/**
 * @dev Internal function that burns an amount of the token of a given
 * account. Uses the internal burn function.
 * @param account The account whose tokens will be burnt.
 * @param value The amount that will be burnt.
 */