rarcrack cannot crack rar

When I carck test.zip. rarcrack can work normally.

`$ rarcrack --type zip t.zip
RarCrack! 0.2 by David Zoltan Kedves (kedazo@gmail.com)

INFO: the specified archive type: zip
INFO: cracking t.zip, status file: t.zip.xml
INFO: Resuming cracking from password: '1fV'
Probing: '1P1' [724 pwds/sec]
Probing: '2oz' [734 pwds/sec]
Probing: '2Y6' [734 pwds/sec]
Probing: '3xL' [737 pwds/sec]
Probing: '47p' [736 pwds/sec]
Probing: '4FQ' [711 pwds/sec]
Probing: '5ec' [710 pwds/sec]
Probing: '5NA' [731 pwds/sec]
Probing: '6n8' [734 pwds/sec]
Probing: '6Wo' [728 pwds/sec]
.......
`

But when I test test.rar, it works out the password word quickly. But this password doesn't match the real pasaword.

`$ rarcrack --type rar test.rar
RarCrack! 0.2 by David Zoltan Kedves (kedazo@gmail.com)

INFO: the specified archive type: rar
INFO: cracking test.rar, status file: test.rar.xml
GOOD: password cracked: '0'
GOOD: password cracked: '1'
`

What's wrong with?
I also want to kown that this the method of decide the length of the first crack.
Thanks.

No source file or test is named. Start by reproducing the reported commands with the ZIP and RAR examples, then trace the RAR cracking path and how it decides a password is valid. Done means the non-matching password result and the first-crack length behavior are explained and corrected.

Written by the indexing model from the issue text.