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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.
nitpick: a minor typo
Given a[N] empty string, return [an] empty string.
The problem should be generalized, in my opinion: instead of asking if the delivery man gets to (4, 5) at every test, add x and y as parameters of the function and ask if the delivery man gets there instead. Also, I'd suggest adding more random tests.