Redirect directory (but not subdirectories) to another directory

How do I redirect a directory to the root of a site? Provided that:

• the root of the site is actually not the root of the domain. ex: it should redirect to ‘www.example.com/website’, not to ‘www.example.com’

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• don’t redirect subfolders. ex: it should redirect ‘www.example.com/website/portfolio’ to ‘www.example.com/website’, but it shouldn’t redirect ‘www.example.com/website/portfolio/project-name’.

It’s a WordPress site and it’s already working with the following rules:

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /website/
RewriteRule ^index.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /website/index.php [L]
</IfModule>
# END WordPress

Thanks in advance!