original url is one of the following:

* `example.com`
* `example.com/index.php`
* `example.com/index.php?c=lorem`

if `example.com` - nothing should be done  

if `example.com/index.php` - it should be visible as `example.com` and here is my code - works fine:

```
RewriteEngine ON
RewriteRule ^index\.php/?$ https://%{HTTP_HOST}/ [NC,R=301]
RewriteRule ^/?$ index.php [L]

```

if `example.com/index.php?c=lorem` it should be visible as `example.com/lorem`

and `lorem` should be accessible by php in both cases:

* if a user type `example.com/index.php?c=lorem` or
* a user type `example.com/lorem`

pls help