Make create_element a static method since it doesn't use self

[nnabeyang]

This change removes the unused self parameter from the create_element method and makes it a static method instead. Since create_element doesn't rely on any instance-specific state, there's no need to call it through self.

[d0iasm]

Thank you for your PR.

In Rust, the method with self is called "method" and the method without self but inside a class is called "associated function".
https://practice.course.rs/method.html

It's totally depending on the preference but I'd like to align with other places if we update a method to an associated function. For example, create_char method in the same file can be an associated function as well. There are many methods that don't depend on self in other classes. If we change one, I'd like to change everything.

I don't know if it's worth changing all methods in other parts so I'd keep the current implementation.
Thank you for the PR again!