code: public static String toQuotedListString(Object[] values) {
  		return Arrays.stream(values).filter(Objects::nonNull)
  			.map(v -> v.toString().toLowerCase())
  			.collect(Collectors.joining(", ", "\"", "\""));
  	}
docs: Generates a string containing a comma-separated list of values in double-quotes.
  Uses lower-cased values returned from {@link Object#toString()} method for each element in the given array.
  Null values are skipped.
  
  @param values array of elements for the list
  
  @return The string with quoted list of elements