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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 absolutely agree with essenov. "You need to return the highest scoring word as a string." - can the author elaborate more on how to decide the string has the highest scoring word? "a = 1, b = 2, c = 3 etc" does not help at all. Needs examples with detailed explanation - I found out that most of the katas do have these problems to make the questions always so ambiguous!
The test cases didnt tip you off?
The description is not clear enough. "You need to return the highest scoring word as a string." The score of the word "abc" could be "123" OR "6" (1+2+3) as it appeared afterwards.