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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.
apparently it's only one space between words, with no leading/trailing spaces. I will add this to the description
This kata asks for problem solution, not to create a raw method without any library.