Why does this dosen’t work
shouldn’t the print macro print in both the cases
would really appreciate a nice explanation,
borrow-checker’s really got to my head coming from java

fn main() {
    let mut s1 = String::from("Hello");
    let s2 = &mut s1;
    let s3 = update_word(s2);
    println!("{}", s2);
    println!("{}", s3);
}

fn update_word(word: &mut String) -> &str {
    word.push_str(" World");
    return "Hello";
}

and this does

fn main() {
    let mut s1 = String::from("Hello");
    let s2 = &mut s1;
    let s3 = update_word(s2);
    println!("{}", s3);
        println!("{}", s2);

}

fn update_word(word: &mut String) -> &str {
    word.push_str(" World");
    return "Hello";
}

Gave error in first and works on seccond