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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.
I've tested your latest solution and it passed the tests as of now, try again and ask away if you still had troubles
This comment is hidden because it contains spoiler information about the solution
Test cases should be updated to
a) check that the original array is not mutated (as per the description)
b) pass in some negative numbers (as the description explicitly says that only positive numbers should be summed)