IsoCodes\Luhn::unDecorate PHP Method

    public static function unDecorate($luhn, $hyphens = [])
    {
        $hyphensLength = count($hyphens);
        // removing hyphens
        for ($i = 0; $i < $hyphensLength; ++$i) {
            $luhn = str_replace($hyphens[$i], '', $luhn);
        }
        return $luhn;
    }