Remove the .html extension. How will Yandex react?

Question

Search Engine Optimization

The site is handwritten, that's why loading pages of the form page.html
It was necessary to remove the .html extension
. I made it with such a code.

<IfModule mod_rewrite.c>
Options +FollowSymLinks
RewriteCond %{HTTP_HOST} ^www\.(.*)$
RewriteRule ^(.*)$ http://%1/$1 [L,R=301]


RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME}\.html -f
RewriteRule ^(.*)$ $1.html


RewriteEngine on
RewriteBase /
RewriteCond %{THE_REQUEST} ^[A-Z]{3,9}\ /([^.]+)\.html\ HTTP
RewriteRule ^([^.]+)\.html$ http://vash-master.tv/$1 [R=301,L]
RewriteCond %{REQUEST_URI} !(\.[^./]+)$
RewriteCond %{REQUEST_fileNAME} !-d
RewriteCond %{REQUEST_fileNAME} !-f
RewriteRule (.*) /$1.html

RewriteCond %{REQUEST_URI} /index
RewriteRule ^(.*)$ http://vash-master.tv/ [R=301,L]

But now Yandex sees duplicates, two pages each - page.html and page.
Ultimately, it is necessary that the pages look like site.ru/page
The 301 redirect comes to mind, but I can’t figure out how to apply it.
Is there any solution?

Answer 1

To remove the extension, you need to transfer it to the CMS, otherwise this action does not make sense.
Yandex will react negatively if redirects are not registered.

Answer 2

Yandex webmaster and sitemap.xml