Localization duplicate page problem when locale set in routes

If we can assign segment 1 of all URLs to locale, the problem will be solved. by this way, canonical URLs created and you can say to search engines.
For example:

https://example.com

will be converted to:

https://example.com/en

Of course this technique should apply to all URLs.

https://example.com/blog/article/1

will be converted to:

https://example.com/en/blog/article/1

I used this approach in CI3 and its SEO results was good and acceptable.

Can anyone say how this possible in CI4, by some sample codes?