Category "uppercase"

Why is capitalizing the first letter of a string so convoluted in Rust?

I'd like to capitalize the first letter of a &str. It's a simple problem and I hope for a simple solution. Intuition tells me to do something like this: le

I am writing C function that convert lowercase char to upper case char with using ASCII but Output is not correct

Okay, So I start working on this, I have code below; +I also have strlen("any string here") func that return len of any str in decimal just keep in your mind. I