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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.
Hi,
You are right. It would be good practice to have something but maybe not a return. The only way to finish the loop is if the input is invalid (e.g. no missing letter). The kata doesn't define what should happen (e.g. there isn't a special error character to return). Maybe throwing an exception would be appropriate.