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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.
The requirements are not realy clear:
"The restriction is that the characters in part1 and part2 are in the same order as in s."
And then there is a test:
canHandleCharactersInWrongOrder(StringMergerTest)