How to redirect a www and non-www subdirectory link to another site

I am trying to redirect this link (www or non-www) to another domain in my .htaccess

fanzilla.com/start => www.example.com

www.fanzilla.com/start => www.example.com

I have tried this code

RewriteEngine On
RewriteCond %{HTTP_HOST} !^www\. [NC]
RewriteRule (.*) http://www.%{HTTP_HOST}%{REQUEST_URI} [R=301,L]
Redirect 301 /start https://www.example.com/t/c/?cid=90968

but it is not working.

How can i do this?