"" is a string object. string objects have a method join(iterable), that produces a string of all elements in iterable seperated (or joined) by whatever the string object's value was.

>> "!".join(["I", "AM", "AWESOME"])
I!AM!AWESOME

I don't understand why the " " before ".join", can anyone explain?

I didn't know you could put all these in one line #based

but if I run "AWUBWUBBWUBC" it will return "A B C" with an extra space between A and B.
How did this code have pass test?

Yes you're supposed to do that ; it's best practice :) See the fork D:)

On your second line you need to write first = first.split() instead of just first.split() and your separator should be a space.

🦆 cause multiples WUB should be replaced by only 1 space...

https://www.codewars.com/kata/reviews/52817f04b70058a1b100003a/groups/5ec9d72950fbac000185b2b4

There are no random tests.

Thats nice!