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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.
In that case, creating a method isPrime is just a duplicate so it's not worthy...
I know it's dumb but it's fun to pass through tests like this x)
You should add a test with spaces at the begining of the string and some one char strings like this :
' a beautiful mountain !! '