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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.
https://www.codewars.com/kata/reviews/5ca9a43775c5da0001856fbe/groups/5caa1ea90d70d200013dc55a
And of course it's a duplicate to all other "hello world" katas.
There's no point in creating a kata for a language feature used almost everywhere on CW.
Also, I'm fairly sure that we already have katas about returning without
return.