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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.
Try these numbers
print powerof4(1125899906842624)
print powerof4(1125899906842625)
the first is 4**25, the second should return false.
See my solution.
I would recomend to fix mistake with test powerOf4(1), because every number^0 = 1;