code: public static List<String[]> splitOnLastColon(List<String> listToSplit) {
          if (listToSplit != null) {
            return Lists.transform(listToSplit, SPLIT_ON_LAST_COLON);
          }
          return Collections.emptyList();
      }
docs: Splits every element in the given list on the last colon in the name and returns a list with
  two elements: The left part before the colon and the right part after the colon. If the string
  doesn't contain a colon, the value is used for both elements in the returned arrays.
  
  @param listToSplit list of strings to split
  @return return list of 2-element arrays or an empty list if the given list is empty or null