rustlings 6.5.0

Small exercises to get you used to reading and writing Rust code!
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fn main() {
    // In Rust, variables are immutable by default.
    // Adding the `mut` keyword after `let` makes the declared variable mutable.
    let mut x = 3;
    println!("Number {x}");

    x = 5;
    println!("Number {x}");
}