remove index.php from codeigniter

delete the .htaccess file from root directory.add new .htaccess file with these codes.

RewriteEngine on
RewriteCond $1 !^(index\.php|public|\.txt)
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php?$1

//find the below code   
$config['index_page'] = "index.php" 
//replace with the below code
$config['index_page'] = ""

//find the below code
$config['uri_protocol'] = "AUTO"
//replace with the below code
$config['uri_protocol'] = "REQUEST_URI" 

thats it.