to_string() gives you an owned string (like std::string) vs a borrowed string slice (kind of like char*). If you already have an owned string you don't need to

to_string() gives you an owned string (like std::string) vs a borrowed string slice (kind of like char*). If you already have an owned string you don't need to do that obviously If you need to keep using Person after calling show() then don't pass ownership to show() - you can pass a reference or a mutable reference, or use Rc<> etc