RewriteEngine On
RewriteBase /

# Redirect /wallet_operation/index.php to /wallet_operation
RewriteCond %{REQUEST_URI} ^/wallet_operation/index\.php$
RewriteRule ^wallet_operation/index\.php$ /wallet_operation [R=301,L]

# Rewrite /wallet_operation to /wallet_operation/index.php internally
RewriteCond %{REQUEST_URI} ^/wallet_operation$
RewriteRule ^wallet_operation$ /wallet_operation/index.php [L]