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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
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Yay! I'm really happy to see someone use Euclid's Algorithm! It looks a lot simpler in code than wikipedia makes it look.
Terse low-performance solutions seems to consistently get rated over more verbose solutions with better Big-O.
This problem should explicitly call out that:
-An input of 0 should return None, not 0
-Inputs may be strings. When they are, the function must return None
Sheeps isn't a word, but sheep is. It's the authors protest of the misspelling.
I'm not sure it's safe to assume that there are only a maximum of 3 WUBs in a row. If there were multiple, you'd wind up with several spaces in a row.