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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.
Looks like he is inactive so this does not matter. That does not negate the fact some of the test cases are not valid "blackjack rule based" cases. Is should just be count the cards in the hand using some concepts from blackjack. Some of the edge cases are not cool.
Not a bad challenge. New to this. Easy to solve if output of most_common() would have been answer. Took me two days to get all the edge cases met, lots of regex learning.