public/subjects/doubtful

doubtful

Instructions

Write a function called doubtful that adds to every string passed to it a question mark (?)

You have to fix the code to make it compile an for that you can only modify the code where is indicated

Expected

pub fn doubtful(s: &mut String) {
}

Usage

Here is a program to test your function

fn main() {
	let mut s = String::from("Hello");

	println!("Before changing the string: {}", s);
	doubtful(&mut s);
	println!("After changing the string: {}", s);
}

And its output

student@ubuntu:~/[[ROOT]]/test$ cargo run
Before changing the string: Hello
After changing the string: Hello?
student@ubuntu:~/[[ROOT]]/test$