public static String genRegCode(String string2, String string3) {
        char[] arrc = new char[16];
        arrc[0] = 9;
        arrc[1] = 6;
        arrc[2] = 11;
        arrc[3] = 13;
        arrc[4] = 8;
        arrc[5] = 2;
        arrc[6] = 15;
        arrc[7] = 4;
        arrc[8] = 12;
        arrc[9] = 14;
        arrc[10] = 3;
        arrc[12] = 5;
        arrc[13] = 10;
        arrc[14] = 7;
        arrc[15] = '\u0001';
        long l = 0L;
        StringBuffer stringBuffer = new StringBuffer(20);
        int n = 0;
        do {
            if (n >= 16) break;
            switch ((int)(l += (long)string2.charAt(arrc[n]) * (long)string3.charAt(arrc[15 - n]) * ((long)string2.charAt(n) + (long)string3.charAt(n)) * ((long)n + 1L)) % 6) {
                case 0: {
                    l += 39L;
                    break;
                }
                case 1: {
                    l += 17L;
                    break;
                }
                case 2: {
                    l += 97L;
                    break;
                }
                case 3: {
                    l += 25L;
                    break;
                }
                case 4: {
                    l += 54L;
                    break;
                }
                case 5: {
                    l += 72L;
                    break;
                }
            }
            ++n;
        } while (true);
        int n2 = 0;
        n = 0;
        while (n < 16) {
            stringBuffer.append((char)(l % (((long)arrc[n] + 1L) * 11L) % 10L + 48L));
            ++n2;
            ++n;
        }
        return stringBuffer.toString();
    }