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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.
Time complexity of this is bad. There is an O(1) solution.
what is the point of splitting the string into an array and then rejoining it into the same string?