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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.
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The same doubt for me ...anyone explain this if you know the answer
some of my test cases are passes except like this:
testDoubleRotate_DoubleArray
class java.lang.Double cannot be cast to class java.lang.Integer (java.lang.Double and java.lang.Integer are in module java.base of loader 'bootstrap')
tell me how to resolve this