Why does this work correctly when n=0? Why when n=0 the output is ""?

thanks!

there used to be support for Python 2

I don't know Rust and I don't plan to invest my time to learn that. If somebody wants to fix that, plase go for that.

(RUST) There are issues with Rust tests, or description of this kata:

1. According to the description key string consists of unique letters and digits. That's not the case for Rust solution - random tests have plenty of duplicate letters in keys.
2. According to the description The message is never shorter than the key.. Again, plenty of random tests that have messages shorter than the key.

In C, this is a very common practice and should be very obvious so I would say it is a best practice. The point you're getting at is good,t though. It's just doing a null check on this string in this way is idiomatic C.

XD

this is Awesome!
i learn a cool trick each line i read.

Man, I tried to do this but failed...

woah this is awesome

Just when I think i know some python, people throw slick code like this on my face.

Very good point, thanks!