How to use slices in rust

rust_slices

fn main(){
    let s = String::from("hello world");
    
    let x = first_word(&s);
    
    
    println!("first word is {}", x);
}


fn first_word(s: &str) -> &str {
    let bytes = s.as_bytes();
    
    for (i, &item) in bytes.iter().enumerate() {
        if item == b' ' {
            return &s[..i];
        }
    }
    
    &s[..]
}