col_row_vals_to_csv([XlsxParser.XmlParser.col_row_val]) :: String.t
get_raw_content(String.t, String.t, module) :: {:ok | :error, String.t}
get_shared_strings(String.t, module) :: {:ok, [XlsxParser.XmlParser.ss]} | {:error, String.t}
validate_path(String.t) :: {:ok | :error, String.t}