Flutterby™! : Okay starting to see what people mean

Okay, starting to see what people mean about refactoring to satisfy the borrow checker in Rust, because, yeah, i can't figure out how to tell it that the "Chars" I'm passing around have an str that's safe.

But now I'm in the "how does one keep generic behavior when structuring code like this?", and maybe the answer is one doesn't?

I can see making a bunch of cheat sheets and trying to make notes about ways to think about data structures differently as I move forward.