   end
 
   @doc """
-  Converts String to underscore case.
+  Converts a string to underscore case.
 
   ## Examples
 

  defp to_lower_char(char), do: char

  @doc """
  Converts String to camel case.

  Takes an optional `:lower` option to return lowerCamelCase.

  ## Examples


  @doc """
  Converts an attribute/form field into its humanize version.

  ## Examples

      iex> Phoenix.Naming.humanize(:username)
      "Username"
      iex> Phoenix.Naming.humanize(:created_at)
      "Created at"
      iex> Phoenix.Naming.humanize("user_id")
      "User"

  """
  @spec humanize(atom | String.t) :: String.t
  def humanize(atom) when is_atom(atom),
