Multiple redirects with 301 htaccess - .htaccess

Question

I am new to redirects and regex. I have an issue with redirects implemented. Here is the example. I want
http://www.example.com/support redirect to
https://www.example.com/support/
But here is what happens
http://www.example.com/support redirects to
https://www.example.com/support redirects to
https://www.example.com/support/
Below is the htaccess contents for it
RewriteCond %{HTTP_HOST} !^www\. [NC,OR]
RewriteCond %{HTTPS} off
RewriteCond %{REQUEST_URI} !^/[0-9]+\..+\.cpaneldcv$
RewriteCond %{REQUEST_URI} !^/\.well-known/pki-validation/[A-F0-9]{32}\.txt(?:\ Comodo\ DCV)?$
RewriteRule ^(.*)$ https://www.example.com/$1 [R=301,L]
# To remove double slash in the middle
RedirectMatch 301 ^/(.*)//(.*)$ https://www.example.com/$1/$2/
# redirect index.php to root
RewriteCond %{THE_REQUEST} ^.*/index\.php
RewriteRule ^(.*)/index\.php$ https://www.example.com/$1 [R=301]
#index to root
RewriteCond %{THE_REQUEST} ^[A-Z]{3,9}\ /index\.php\ HTTP/
RewriteRule ^index\.php$ https://www.example.com/$1 [R=301,L]

Answer 1

You can use these rules t avoid multiple redirecects:
RewriteEngine On
RewriteCond %{HTTP_HOST} !^www\. [NC,OR]
RewriteCond %{HTTPS} off
RewriteCond %{REQUEST_URI} !^/[0-9]+\..+\.cpaneldcv$
RewriteCond %{REQUEST_URI} !^/\.well-known/pki-validation/[A-F0-9]{32}\.txt(?:\ Comodo\ DCV)?$
RewriteRule ^ https://www.example.com%{REQUEST_URI} [R=301,L,NE]
## Adding a trailing slash
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule [^/]$ %{REQUEST_URI}/ [L,R=301,NE]
# To remove double slash anywhere
RewriteCond %{THE_REQUEST} \s[^?]*//
RewriteRule ^.*$ /$0 [R=302,L,NE]
# redirect index.php to parent
RewriteCond %{THE_REQUEST} /index\.php [NC]
RewriteCond %{REQUEST_URI} ^(.*/)index\.php$ [NC]
RewriteRule ^ %1 [L,R=301,NE]
Make sure to use a new browser for testing.

Answer 2

#anubhava your edit shows the attachment 1
The existing code in the question I posted does below
However, I am looking for a single redirect to the final destination..
Recent update by adding trailing slash results are below