[BUG] Application accepts invalid flags

[bershanskiy]

Describe the bug
Application accepts invalid commands with nonexistent flags.

To Reproduce
Steps to reproduce the behavior:

1. Go to the website
2. Enter git commit -ainvalid
3. Observe that the output is as if user entered git commit -a. In other words, (1) program assumes that the flags will not be combined and (2) does not really validate the inputs.

Expected behavior
Application says something like error: unknown switch l'and possibly explains meaning of all other flags,-a, -i, -n, -v`.

Screenshots
N/A

Desktop (please complete the following information):

• OS: Ubuntu
• Browser Chrmium
• Version 109

Additional context
Found this website when looking into darkreader/darkreader#10657