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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.
Be carefull with substring as you are introducing a loop in a loop.
This is not O(n) anymore.
It is not O(n) because of replace
Bad solution with square complexity -> you need a map...
Also hard to read.