title: Route to a specific controller in codeigniter
body: <p>I am using codeigniter for the back end of my website.
  For that I have created admin folder inside my controller.
  My issue is that when i type the url</p>
  
  <blockquote>
    <p><a href="http://localhost/varma/admin" rel="nofollow">http://localhost/varma/admin</a></p>
  </blockquote>
  
  <p>It should redirect to the file login.php which is inside the contollers/admin</p>