code: public static int damerauLevenshteinDistanceCaseInsensitive(String str1, String str2) {
          return damerauLevenshteinDistance(str1.toLowerCase(), str2.toLowerCase());
      }
docs: Convenience method for calling {@link #damerauLevenshteinDistance(String str1, String str2)}
  when you don't care about case sensitivity.
  
  @param str1  First string being compared
  @param str2  Second string being compared
  @return      Case-insensitive edit distance between strings