rustlings 6.5.0

Small exercises to get you used to reading and writing Rust code!
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// TODO: Add the missing type of the argument `num` after the colon `:`.
fn call_me(num:) {
    for i in 0..num {
        println!("Ring! Call number {}", i + 1);
    }
}

fn main() {
    call_me(3);
}