This module enabled you to use the same store_code multiple times for different websites in the url by removing the website_code from the store_code before adding it to the url. So "example.com/website_en/", will become "example.com/en/".
The module has configuration to enable/disable it in the web/url section.
Important: the store code should include the website code otherwise it won't do anything.
In order for direct links to work, you must set base urls on website level.
In "Stores -> Configuration -> General -> Web -> Base Urls", "web/unsecure/base_url" or "web/secure/base_url" or both must be filled. The values must be present at website level.