Rails - Mar 2009 - How to Change Up Methods According to Parameter

Hi..
I have two methods.but the parameter will be changing.
For the first method i send only one parameter(f).
But for the second method i''ll send 3
parameters(f,search_string_1,search_string_2).
And also for 3rd Method i send Two Parameter(f,search_string).

Is it possible to optimise below methods into Single Methods .
How can i combine the below Three Methods into one method pls help me.


#method 1
def check_chat_type(f)
 Dir.foreach(File.join(RAILS_ROOT +
"/public/ACMServer_exe/ChatHistory",f)) do sub_folder_name|
   if sub_folder_name.include? "Vs"
     get_path(f,sub_folder_name)
   end
 end
end

#method 2
def check_chat_type(f,search_string_1,search_string_2)
  Dir.foreach(File.join(RAILS_ROOT +
"/public/ACMServer_exe/ChatHistory",f)) do
  |sub_folder_name|
    if sub_folder_name.include? "Vs"
      if sub_folder_name.include?(search_string_1)
        if sub_folder_name.include?(search_string_2)
          get_path(f,sub_folder_name)
        end
      end
    end
  end
end

#Method 3
def check_chat_type(f,search_string)
  Dir.foreach(File.join(RAILS_ROOT +
"/public/ACMServer_exe/ChatHistory",f)) do
  |sub_folder_name|
    if sub_folder_name.include? "Vs"
      if sub_folder_name.include?(search_string)
        get_path(f,sub_folder_name)
      end
    end
  end
end
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# this makes param 2 and 3 optional (if none is passed default values
are set to empty string):
def check_chat_type(f, search_string_1="",
search_string_2="")
...
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