Loading collection data...
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.
This comment is hidden because it contains spoiler information about the solution
Aggregate adds the next item to the previous aggregate, so, for strings in .Net it will be creating a new string for every next iteration, which is not optimal normally.
I would try to avoid aggregate with strings in such scenarious.