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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're not making arsenals here, we must write a program to do a task. Input validation has been done in many old katas and is now considered a bad practice for the reason I mentionned. Checking the input is a negative number is 8 kyu kata level. It's of course interesting to know how to do that, but mixing this with a totally independent task like finding multiples of a number doesn't bring any value, in real context it'd be better to handle input validation separately from the main algorithm.
Most languages already do. And better for those that don't, since it doesn't bring any value to the task.