Redirect www to subdomain with masking

I'm totally stuck here, and I've read and tried countless suggestions, but it still doesn't work. I would really appreciate a custom solution to this.

I have a wordpress site installed at subdomain what is actually a subdirectory located in \wordpress.

While my redirect is working, and users are forwarded from www to wordpress subdomain, I need the users not to see the - i.e. I need them to see only all the time.

This is what I have in my .htaccess file, but it does nothing:

RewriteEngine On
RewriteCond %{HTTP_HOST} ^(www\.)?domain\.com$ [NC]
RewriteRule ^wordpress/(.*)$$1 [L]

For the reference here's the full htaccess file:

RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]

#Options +FollowSymLinks
#RewriteCond %{HTTP_HOST} ^ [NC]
#RewriteRule ^(.*)$$1 [L,R=301]

# uploaded files
RewriteRule ^([_0-9a-zA-Z-]+/)?files/(.+)
wp-includes/ms-files.php?file=$2 [L]

# add a trailing slash to /wp-admin
RewriteRule ^([_0-9a-zA-Z-]+/)?wp-admin$ $1wp-admin/ [R=301,L]

RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ - [L]
RewriteRule  ^[_0-9a-zA-Z-]+/(wp-(content|admin|includes).*) $1 [L]
RewriteRule  ^[_0-9a-zA-Z-]+/(.*\.php)$ $1 [L]
RewriteRule . index.php [L]


Options +FollowSymLinks
RewriteEngine on
RewriteCond %{HTTP_HOST} ^ [NC]
RewriteRule ^(.*)$$1 [L,R=301]

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