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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.
Ya, it looks like you are removing the correct answer from the string itself. I recommend duplicating the input string before you begin to modify it, that way the input stays the same.
I'm not sure which language you use, apparently you mutate
numbers:Resolved for a better issue (raised above)
Did you mutate the input string?