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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.
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this is by far the cleanest solution. 🏆
I appreciated the kata; it was well-constructed. However, I found the phrasing a bit ambiguous. As an enthusiast of OOP, when I encounter the word 'extend', especially in contexts like "extend the built-in Array class with the following methods...", my mind jumps to the concept of subclassing and inheritance. Perhaps a different term could be used to more clearly convey the intention
this should be a 8kyu problem not a 7kyu
the question is misleading. It says we should return a new string from s1 OR s2 but the solution is saying we should return a new string from s1 AND s2.
this function, although returns a string output, there is still spaces at the begining and of the string.