Fix this

Author: andreibondarev

lib/langchainrb_rails/generators/langchainrb_rails/assistant_generator.rb

@@ -83,9 +83,8 @@ def copy_stylesheets
       # TODO: Depending on the LLM provider, we may need to add additional gems
       def add_to_gemfile
         gem_name = "turbo-rails"
-        gemfile_content = File.read(Rails.root.join("Gemfile"))
 
-        if gemfile_content.include?(gem_name)
+        if gem_exists?(gem_name)
           say_status :skipped, "#{gem_name} already exists in Gemfile"
         else
           inside Rails.root do
@@ -102,6 +101,10 @@ def post_install_message
 
       private
 
+      def gem_exists?(gem_name)
+        File.read(Rails.root.join("Gemfile")).include?(gem_name)
+      end
+
       # @return [String] LLM provider to use
       def llm
         options["llm"]