How to remove page duplicate from index.php?

Question

CodeIgniter

Hello everyone, there is a problem
search engines have started to have duplicate pages
site/index.php/category...
site/category/1/333
How to remove index.php from the middle?
a redirect from index.php to / is done, but not when it is in the middle of the url
in the same way as in request 2, make a redirect to site/category/1 (that is, remove 333)
Please tell me, I can’t figure it out, I will be very grateful
UPD
Now so htaccess looks like:

<IfModule mod_rewrite.c>
  RewriteEngine On
  
  RewriteRule (.+)/$ /$1 [L,R=301]
  
  RewriteBase /
  RewriteCond %{REQUEST_FILENAME} !-f
  RewriteCond %{REQUEST_FILENAME} !-d
  RewriteRule ^(.*)$ index.php/$1 [L]
  
  RewriteCond %{THE_REQUEST} ^[A-Z]{3,9}\ /index\.php\ HTTP/
  RewriteRule ^index\.php$ http://xn----7sbbcusc3afgldd9b0a7j\.com [R=301,L]

  RewriteCond "%{HTTP_HOST}"   "!^xn----7sbbcuc3afgl9b0a7j\.com" [NC]
  RewriteRule "^/?(.*)"       "http://xn----7sbbcusc3afgldd9b0a7j\.com/$1" [L,R,NE]
</IfModule>

Answer 1

Codeigniter has always had very detailed documentation
https://www.codeigniter.com/userguide3/general/rou...