Which katas?

Ok for Python.

Looks good, thanks.

Forked and approved, thanks for the review.

Rust approved.

Language?

Added "1?x1?=1??" as a fixed test, but my solution turns out to be wrong... So I need to fix it before approval. I'll try to fix...

Fixed in new fork.

Language?

frankzig: I eventually implemented your solution since it seems correct. I'd have prefered to understand what's wrong with my original solution but it's probably better to fix the issue sooner... Thanks again for the feedback. Any enlightment appreciated about the issue :)

This one should be resolved, BTW.

It's still bad (using frankzig's code, which seems alright):

With arr = [3 42 52 -45 46 -11 -11 12], command = "<<"
Expected
    <[][]int | len:3, cap:4>: [[3, 42, 52], [3, 42, 46], [-45, -11, 12]]
to equal
    <[][]int | len:4, cap:4>: [[3, 42, 52], [3, 42, 46], [-45, -11, 12], [-45, -11, 12]]

Maybe should I just implement frankzig's solution, but it annoys me not to figure out the problem while the solution is similar to others I used in several languages...

I thought it didn't and could not find the error... But I will trust you. I've been a bit away from programming for a while...

Thanks

Approved

I've approved your fork fixing this issue. Thank you!