diff --git a/README.md b/README.md
index 332d06e..4f2c456 100644
--- a/README.md
+++ b/README.md
@@ -25,7 +25,6 @@ Use at your peril, _for now._
   - [] find types referenced in the moved specs
   - [] find private functions references in refactored fn bodies.
   - [] update test file refs by CLI option
-  - [] format changes
   - [] ElixirLS integration for VSCode?
   - [] Write the module code to rename usages of the refactored function
   - [] guthub actions, run test suite
@@ -34,6 +33,7 @@ Use at your peril, _for now._
   - [X] Write a mix task to invoke the Refactorer
   - [X] dry-run option
   - [X] CLI output, list files changed and created.
+  - [X] format changes
 
 ## Installation
 
diff --git a/lib/ex_factor.ex b/lib/ex_factor.ex
index 93fe7a7..be5144f 100644
--- a/lib/ex_factor.ex
+++ b/lib/ex_factor.ex
@@ -13,11 +13,23 @@ defmodule ExFactor do
   alias ExFactor.Remover
 
   @doc """
-  Call Extractor module emaplce/1
+  Call Extractor, Remover, and Formatter modules
   """
   def refactor(opts) do
+    source_module = Keyword.fetch!(opts, :source_module)
+    target_module = Keyword.fetch!(opts, :target_module)
+
+    opts =
+      opts
+      |> Keyword.put_new(:target_path, path(target_module))
+      |> Keyword.put_new(:source_path, path(source_module))
+
     emplace = Extractor.emplace(opts)
     remove = Remover.remove(opts)
     {emplace, remove}
   end
+
+  def path(module) do
+    Path.join(["lib", Macro.underscore(module) <> ".ex"])
+  end
 end
diff --git a/lib/ex_factor/extractor.ex b/lib/ex_factor/extractor.ex
index 34d8b66..f575e08 100644
--- a/lib/ex_factor/extractor.ex
+++ b/lib/ex_factor/extractor.ex
@@ -67,9 +67,7 @@ defmodule ExFactor.Extractor do
     end
   end
 
-  defp path(module) do
-    Path.join(["lib", Macro.underscore(module) <> ".ex"])
-  end
+  defp path(module), do: ExFactor.path(module)
 
   defp refactor_message, do: "#refactored function moved with ExFactor"
 
diff --git a/lib/ex_factor/remover.ex b/lib/ex_factor/remover.ex
index bdc6fd9..f4ab270 100644
--- a/lib/ex_factor/remover.ex
+++ b/lib/ex_factor/remover.ex
@@ -65,7 +65,5 @@ defmodule ExFactor.Remover do
     File.write(path, contents, [:write])
   end
 
-  defp path(module) do
-    Path.join(["lib", Macro.underscore(module) <> ".ex"])
-  end
+  defp path(module), do: ExFactor.path(module)
 end