Custom Post Type and Taxonomy

Create file named post-types.php in the mu-plugins (must use) folder:

wp-content/mu-plugins/post-types.php

If You’re using variables, only it’s name need to be changed

You can use more parameters

Remove slug from custom post type post URLs

If You don’t want to use the Custom Post Type’s slug, just paste this snippet in your functions.php and rewrite the post type: