.htaccess重写文件夹路径的文件路径

Question

I have a subdirectory contact and inside contact.php and contact_content.php and .htaccess file

In .htaccess file I have following code:

Options +FollowSymLinks
RewriteEngine on

RewriteCond %{REQUEST_URI} ^/contact/contact.php
RewriteRule ^ /contact [R=301,L]

RewriteRule ^/$ contact.php [NC,L,END] 

# deny access
RewriteRule ^(contact_content)\.php - [F,L,NC]

Deny access part and the first rewrite rule work perfectly but the problem is the second rewriterule-> when I go to localhost/contact I am shown the list of files in contact directory instead of contact.php site