.htaccess route with mod_rewrite for static php site

For a static php website (only flat files and no DB) need to rewrite and maybe PHP route URLs. Site index, its HTML content, and its head file are under the root (HTTP:localsite/[login to view URL]). Include files for all other pages (like menu, header, and footer) are under the "inc" folder. Content (all other site's pages but HTTP:localsite/[login to view URL]) for different pages are under the "file" folder. The rules should be like WP permalinks also no page-name .PHP or .HTML extensions will be visible to the end-user and each page in the file directory should be written as a subfolder under the root. Example for all pages but the main index page HTTP://localhost/files/[login to view URL] should be written as HTTP://localhost/somefile/ and HTTP://localhost/files/[login to view URL] redirects to HTTP://localhost/somefile/ For HTTP://localhost/[login to view URL] only it should be HTTP://localhost/ The solution should not undermine the speed and functionality of the site. We rather do it through .htaccess file unless 100% necessary to add PHP router. Please no price place holders (place your final price and exact delivery time) and mention that I am a developer myself and only outsourcing this part of the project as have not enough time. If needed I can provide the project files in a zip file so you can try locally but it should work under my localhost (or any domain, hosting and under the public-html) in wamp too. Until the project is 100% done will not release any fund and before fully functional will not leave a review. Thanks for your time and consideration