use std::option::{Self, Option};
 
public entry fun create_collection(creator: &signer) {
    let royalty = option::none();
    let collection_constructor_ref = &collection::create_unlimited_collection(
        creator,
        "My Collection Description",
        "My Collection",
        royalty,
        "https://mycollection.com",
    );
    let mutator_ref = collection::generate_mutator_ref(collection_constructor_ref);
    // Store the mutator ref somewhere safe
}