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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.
You need to add
return string
as your final statement so it knows what to return, otherwise nothing is returned - hence "None" (the default value) is returned. Returning a value means that the value is modified and can be used to check for equality.