5. Create and use functions, 6. Simple error handling with `expect()`

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https://github.com/prophen/intro-to-rust/blob/nikema's-notes/exercises/05.md
https://github.com/prophen/intro-to-rust/blob/nikema's-notes/exercises/06.md

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use std::io;

fn main() {

    println!("Please enter the first number: ");
    let mut first = String::new();
    io::stdin().read_line(&mut first).unwrap();
    let a: u32 = first.trim().parse().expect("Not a number");

    println!("Please enter the second number: ");
    let mut second = String::new();
    io::stdin().read_line(&mut second).unwrap();
    let b: u32 = second.trim().parse().expect("Not a number");

    let result = sum(a, b);
    println!("Result: {}", result);
}
fn sum(a: u32, b:u32 ) -> u32 {
    a + b
}

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