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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.
Well, I believe in YAGNI (especially when solving katas, but also in real life).
If it's not part of the requirements - why bother myself with that?
Please add more instructions for negative values. What is the interprtation for the minus sign? should it be just added to the first digit?
Not clear enough...