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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.
Not necessary to convert to cArray to return str. The test can be done on str.length()
Works but not thread safe due to static "missing" varaible. If 2 threads calls this method at the same time, result will be wrong.