Remove unused function heads

Basically `___` will always quote as a tuple.

lib/blanks.ex

@@ -11,11 +11,9 @@ defmodule Blanks do
     {args, replacements} = Macro.prewalk(args, replacements, &pre_pin/2)
     {put_elem(node, 2, args), replacements}
   end
-  defp pre(:___, [first | remainder]), do: {first, remainder}
   defp pre({:___, _, _}, [first | remainder]), do: {first, remainder}
   defp pre(node, acc), do: {node, acc}
 
-  defp pre_pin(:___, [first | remainder]), do: {pin(first), remainder}
   defp pre_pin({:___, _, _}, [first | remainder]), do: {pin(first), remainder}
   defp pre_pin(node, acc), do: {node, acc}
 
@@ -32,7 +30,6 @@ defmodule Blanks do
     |> elem(1)
   end
 
-  defp count(:___ = node, acc), do: {node, acc+1}
   defp count({:___, _, _} = node, acc), do: {node, acc+1}
   defp count(node, acc), do: {node, acc}