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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.
We don't know, but this is not a kata issue (= a bug). There is a documentation guide that may help you (see left panel).
In sieve of eratosthenes I don't get what - should do on ' ' since it gets pushed after " ". Am I missing something? All other tests are correct...