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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.
The formatting seems a bit obscure to me, but very short solution!
I feel like this should be raised to 5th or 4th kyu. Especially considering that Valid Parenthesis, which this challenge expands upon, is a 5th kyu challenge.
I think this solution is the easiest to read (apart from the variable naming).
I did not understand the problem before this explanation. Thank you!