Redirect Trailing Slashes...Problem

I have 2 problems:

When i call the following URL with a trailing slashe (news is Controller):
http://localhost/ci4/public/news/

It removes the 'root' and 'public' and redirects to :
http://localhost/news

is it a problem or i'm wrong?

And another problem is: in the public/.htaccess and in the Redirect Trailing Slashes section, it does not check if the requested resource is Dir or not

Code:

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

should we put following line before above?

Code:

RewriteCond %{REQUEST_FILENAME} !-d

You can see this StackOverflow answer.