Naming conventions in Rust language

naming_conventions_in_rust.rs

fn main() {}

fn get_product(
    
) {
    let product_id = 42;
}

macro_rules! print_rating {
    () => {
        println!("Rating 5 stars");
    };
}

struct SimpleProduct {}
type ProductPrice = f64;
trait ProductKind {}

const DAYS_OF_THE_WEEK: i32 = 7;