Get number (i32) in using a function

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• We have not learned functions yet, but in order to make it easier to copy paste this example later we have a solution here

examples/stdin/get-number-function/src/main.rs

use std::io;
use std::io::Write;

fn main() {
    let x = get_number();
    println!("{x}");
}

fn get_number() -> i32 {
    let mut number = String::new();

    print!("Please type in an integer: ");
    io::stdout().flush().expect("Oups");
    io::stdin()
        .read_line(&mut number)
        .expect("Failed to get input");

    let number: i32 = number.trim().parse().expect("Could not convert to i32");

    number
}