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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.
to_string() is essentially a wrapper for impl Display. I think this is the u64 implementation of it: https://doc.rust-lang.org/src/core/fmt/num.rs.html#199-258 Looks like there is some cost, but I can't speak to how much of it is optimized out in release mode.
I was disappointed that the answers were incorrect, had to figure out a way to calculate the wrong answer to finish the kata. This problem uses floating point math, not integer math.
105 is the correct answer to this problem. Do the math by hand, the right answer is 104.8695.