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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
Thank you, I did not realize I returned an int in place of a long.
No, katas are retired when they're too poor in quality and/or they're complete duplicates.
Wwwwwwwwwwwwoooooooooow!
Well, it's up to you to write good tests ;-)
Though this kata is a duplicate to many existing katas (just search for
prime), so it's likely to be retired soon. Better luck next time ;-)