I look for perfect url rewriting for good web ranking

[eluser]n0xie[/eluser]
Why would you go to all this trouble for something as trivial as SEO. As long as your URL's are unique, and segments of it represent keywords or properties of the content it is displaying, your site is considered SEO-friendly. What you're doing is just plain silly. You should just use Routing and Canonical links if you want your URL's to be prettier than they already are.