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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.
Good solution. Although by first splitting, you're iterating over the string twice. Everything could be done in one go. Splitting it to then iterate over it is a bit wasteful.