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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.
It's a problem with your code, in the sample tests it's failing the test with 25 as input, but if you try your code using 15 as input before (in repl.it for instance), it'll fail too, figure out why.
not an issue. Or document it properly.
(and do never post code without a spoiler flag)