public function endPrintf($string)
    {
        if (empty($string)) {
            return '';
        }
        $this->endTime[$string] = microtime(true);
        $time = $this->endTime[$string] - $this->startTime[$string];

        $this->stdout(
            '/*** End ' . $string . ' ... done (time: ' . sprintf("%.3f", $time) . "s) ***/" . self::ENTER . self::ENTER,
                0,
                Console::FG_GREEN
            );

        return 0;
    }