docs: public static String intersectingConcatenate(String a, String b) {
  
      // find length of maximum possible match
      int lenOfA = a.length();
      int lenOfB = b.length();
      int minIntersectionLen = min(lenOfB, lenOfA);
  
      // search down from maximum match size, to get longest possible intersection
      for (int size = minIntersectionLen; size > 0; size--) {
        if (a.regionMatches(lenOfA - size, b, 0, size)) {
          return a + b.substring(size, lenOfB);
        }
      }
  
      // Didn't find any intersection. Fall back to straight concatenation.
      return a + b;
    }