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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.
Most straight forward!!!
Good!
Excellent solution, thanks for also adding the comments with the explanation.
Be carefull with substring as you are introducing a loop in a loop.
This is not O(n) anymore.