Pastable version of Contoller refactoring

<pre class='prettyprint' language='ruby'>def invite_friends
    user_name =  params['user_name']
    emails =  params['recipient_list']
    @message = params['message']
    
    @error = []
    if user_email.blank? 
     @error &lt;&lt; &quot;Please enter your email.&quot;
     flag=false
    end    
    
    if user_name.blank?
      @error &lt;&lt; &quot;Please enter your name.&quot;
      flag=false
    end
    
    if emails.blank?
      @error &lt;&lt; &quot;Please enter email addresses of friends.&quot; 
      flag=false
    end
    
    if @message.blank?
      @error &lt;&lt; &quot;Please enter message.&quot; 
      flag=false
    end

unless emails.blank?
      emails=emails.split(&quot;,&quot;)
      emails.delete_if {|x| x.blank? }
      if emails.blank?
        @error &lt;&lt; &quot;Please enter email addresses of friends.&quot; 
        flag=false
      end  
    end
    
        
    if flag
      send_emails(user_email,user_name,emails,@message)
    end
end</pre>
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Pastable version of Contoller refactoring