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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.
Not an issue
I think the prompt is a too simple. Essentially only calls for concatenation and capitalization of strings, while not giving examples of concatenation in the prompt itself. The test given is the only indication of what concatenation is for a beginner.