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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.
Get started now by creating a new collection.
I like how we needed to return an empty string if given an empty string... As it was not mentioned in the description, unless this is a known step in all challenges that I did not know before today. Maybe it's because I used an imperative approach? Sorry I'm still learning.