fn dump(s: &str) {
    println!("{}", s);
}
fn array_to_string(arr: &[i32]) -> String {
    let mut res = "[".to_string();
    for v in arr {
        res += &v.to_string();
        res += ", "
    }
    res.pop();
    res.pop();
    res.push(']');
    res
}
fn main() {
    let txt = "test test";
    let string_text = txt.to_string();
    let mut string_verctor = String::new();
    string_verctor.push('H');
    string_verctor.push_str("hii");
    dump(&string_verctor);
    dump(txt);
    dump(&string_text);

    let arr2 = &[3, 2, 1, 0, -1];
    let res = array_to_string(arr2);
    let formated = format!("hello {}", res);
    println!("{}", formated);
}