I have one problem about the redirecting I want to make redirect to example.com/product-bag.html to example.com/product-bag

I want to redirect but not affect the website’s keywords in Google.

What I Try

when I add the code below:

rewrite ^/ .html$ https://example.com permanent;

When restarting Nginx, I get an error saying I can’t save the file

I’m not sure if that’s the right thing to do or not. Thank you!