<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /wordpress/
RewriteRule ^index.php$ - [L]

RewriteRule ^(.*)/$ /$1 [L,R=301]

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /wordpress/index.php [L]
</IfModule>

<IfModule mod_rewrite.c>
 RewriteEngine On
 RewriteBase /wordpress/
 RewriteRule ^index.php$ - [L]

 RewriteCond %{REQUEST_URI} !^/wp-admin/
 RewriteCond %{REQUEST_URI} ^/wp-login.php(.*)$
 RewriteCond %{REQUEST_URI} ^/wp-admin$
 RewriteRule ^(.*)/$ /$1 [L,R=301]

 RewriteCond %{REQUEST_FILENAME} !-f
 RewriteCond %{REQUEST_FILENAME} !-d
 RewriteRule . /wordpress/index.php [L]
 </IfModule>