Exercise 7 main function different from solution

[dong-zh]

The exercise has a trailing comma in the key values, while the solution does not.

Solution:

fn main() {
    let value = "my_string";
    let my_hashmap = hashmap!(
        "hash" => "map",
        "Key" => value // <- no comma
    );

    print_hashmap(&my_hashmap);
}

Exercise:

fn main() {
    let value = "my_string";
    let my_hashmap = hashmap!(
        "hash" => "map",
        "Key" => value, // <- comma
    );

    print_hashmap(&my_hashmap);
}