fn foo(i: &mut i32) {
    // do stuff
}

fn main() {
     // I have to bring &mut behind a RAW DATA. not a variable.but RAWDATA
     // I have to deref i in foo before doing anything with it
     // which will give me this error: you cant deref an ineteger !!
    foo(&mut 10)

    foo(10) // I want to use this and I want rust be smart enough to deduce what does it mean
}