I am trying to redirect all non-www to www on my website! My SSL is already configured to redirect all http to https but all what I have found is working only partially for me!

if I type mysite.com/en/articles/12/how-to-code, for example I am redirected to www.mysite.com/index.php which should have been www.mysite.com/en/articles/12/how-to-code

I have tried solutions to this SO question, I know this question is a possible repeat but other solutions have not worked for me! Am using apache2.

This my .htaccess in the /public folder

<IfModule mod_rewrite.c>
    <IfModule mod_negotiation.c>
        Options -MultiViews
    </IfModule>

    RewriteEngine On

    # Redirect Trailing Slashes If Not A Folder...
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteRule ^(.*)/$ /$1 [L,R=301]

    # Handle Front Controller...
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteRule ^ index.php [L]

    # Handle Authorization Header
    RewriteCond %{HTTP:Authorization} .
    RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization}]

    # Redirect to www
    RewriteCond %{HTTP_HOST} ^[^.]+\.[^.]+$
    RewriteCond %{HTTPS}s ^on(s)|
    RewriteRule ^ http%1://www.%{HTTP_HOST}%{REQUEST_URI} [L,R=301]
</IfModule>

Thanks in advance