Remove slash at the end of nginx request?

Question

Nginx

Good afternoon!
There is a site whose root looks like this site.ru/site/ The task is to remove this / at the end of this address.
Moreover, there are sections of this kind site.ru/site/internet, and in this case / at the end is already removed.

There are already rules

spoiler

if (!-f $request_filename){
set $rule_2 1$rule_2;
}
if (!-d $request_filename){
set $rule_2 2$rule_2;
}
if (!-e $request_filename){
set $rule_2 3$rule_2;
}
if ($request_filename !~ "-l"){
set $rule_2 4$rule_2;
}
if ($rule_2 = "4321"){
rewrite /(.+) /./index.php?path=$1 last;
}
if ($request_uri ~* "\/\/") {
rewrite ^/(.*) $scheme://$host/$1 permanent;
}

Website on FastCGI (Apache) is proxied by NGINX