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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.
The initial string has a lot of white space and is 173 characters, but the resulting string after making it into a hashtag is 140 characters long. My guess would be that you're rejecting the hashtag based on the initial string length, and not the actual hashtag length.
What?
The string is 140 characters long. You should only return false if it is longer than that.