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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.
Fixed.
That is entirely up to you.
""is a string like any other, and soparensToTree("")should return some kind of tree, so that if you calltreeToParenson that tree, you get the empty string back again.This is not an issue with the kata, so I am going to close this.
Closing.
don't mutate the input.