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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.
This algorithm already does end if the string starts with ')'. An odd number of characters can be a valid string since the string includes characters that we don't pay attention to.
It's 3 times faster than yours and WAY cleaner.