same

You can't change the order of the arguments, they always have to be a, b, c. If the arguments are 1,3,1, then 3*(1+1) would have the arguments arranged as b, a, c which is invalid.

Wow !
What a solution!

It's beyond 8 kyu I believe.
Also, some of the test are wrong as mentioned like:
1,3,1 the result is 5 while 3*(1+1)=6 ?

I Think this is a really good solution

I knew that there is a really easy way with idiomatic rust but I wanted to see if I can solve it without looking anywhere with basic syntax.

Agreed

It's not a best practice though, if there is a unwrap there is no best practice imo

Nothing wrong with any of it.

Very nice, approved ! I see you got chai working now, perhaps an update on all katas incoming once language version update has been requested ! ^^

Bad opinion.

CoffeeScript translation

Fixed.

Bad Kata and Bad Description.

I don't know if it's the best practice or not but I meet the strings.Builder concept, thanks