How to manipulate URL with .htaccess for PHP?

My goal is to manipulate the URL bar, so it would be simpler for users.

Im using htaccess and want to manipulate a URL

Current URL is: localhost/test/htdocs/invite?code=AB2A

I want the URL to be: localhost/test/htdocs/invite/ABAC

How could I use htaccess to accomplish this? I want the user to be able to type in localhost/test/htdocs/invite/ABAC and for it to work with my code, because currently they have to write localhost/test/htdocs/invite?code=AB2A

I am currently using this code:

RewriteCond %{QUERY_STRING} (^|&)code=([^.?]+)($|&)
RewriteRule ^test/htdocs/invite\.php$ /test/htdocs/invite/([^.?]+)? [L,R=301]

However, it says 404 Not Found