My experiment with "Programming A Guessing Game" @https://doc.rust-lang.org/book/ch02-00-guessing-game-tutorial.html

guess_number.rs

/// A game
pub mod guess_number {

    /// Announces the game to be played
    pub fn announce_game() {
      println!("");
      println!("--------------------------");
      println!("|    Guess A Number!     |");
      println!("--------------------------");
    }

    /// Pick a number, any number
    pub fn pick_number() -> String {
      use std::io;
      println!("    Make a guess: ");
      let mut guess = String::new();
      io::stdin().read_line(&mut guess).expect("ERROR - Failed to read line.");
      return guess;
    }

    /// Publishes the number
    pub fn tell_world(numb: String) {
       println!("    You guessed: {}", numb);
    }
}

/// A game played
fn main() {
  guess_number::announce_game();
  let who_knew = guess_number::pick_number();
  guess_number::tell_world(who_knew);
}

I am exploring the capabilities of Rust in comparison to some other languages I know. I spent a couple hours this evening in the Rust Docs, and Rust by Example while working on and debugging my extended Programming A Guessing Game solution via cargo {check, build, run} on the command line. It was very interesting.