In my website I changed the directory name "vehicles-cars" to "vehicles-cars-for-sale". When I tried to redirect using a wild card redirect from my old directory name to new directory name in my web hosting cPanel account, I get an error every time I open pages from that directory:

this webpage has a redirect loop

The website is php.

The problem is that that I have lots of pages with the old directory indexed in Google and they are getting duplicate content.

I really need some advice on what to do with this problem.

Here is .htaccess file code for redirect, thanks.

RewriteEngine on

RewriteCond %{HTTP_HOST} ^adsbuz\.com$ [OR]
RewriteCond %{HTTP_HOST} ^www\.adsbuz\.com$

RewriteRule ^vehicles\-cars\/?(.*)$ "http\:\/\/adsbuz\.com\/vehicles\-cars\-for\-sale\/$1" [R=301,L]