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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.
Suggest showing an example of using map in the description, maybe something like:
It looks like the logic checking to see if push/pop is called during reverse may be incorrect. It is asserting I am not calling them in the reverse function, but they are infact called as long as the string isn't empty.