Good thinking, thank you for taking the time to explain it.

While writing the code I was expalining it to a friend he asked questions I then answered with the comments.
In retrospect, it is a bit too much, you are right. I need to learn how synthesize my thoughts better.

Either way, thank you very much for your feedback, and for reading my code.

I can appreciate effective commenting, but this is perhaps too much for the effect of such a function.

Good point. This solutions does not correctly handle upper camel case.

The test_solution_randomly function strips the uppercase letter from the start of the sentence with:

            sentence.push_str(&word_selection.next().unwrap()[1..]);

So I take it this problem is only intended for lower camel case.

The problem statement should probably be made to be more specific.

I see someone already reported the issue:

https://www.codewars.com/kata/5208f99aee097e6552000148/discuss/rust#6181ac3bac59440057e75f57

Lol I don't blame you. It is very confusing, even to myself when I'm trying to understand what I wrote a year ago.

I would never write this kind of code for production. What happens on CodeWars stays on CodeWars or something, I guess.

Doesn't this function fail to account for a string that may start with a capital letter?

Take the example "CamelCase", this function output " Camel Case" instead of the intended "Camel Case".