code: private double winkler(double totalScore, String S, String T) {
      totalScore = totalScore + (getPrefix(S, T) * 0.1 * (1.0 - totalScore));
      return totalScore;
    }
docs: winkler scorer. Compute the Winkler heuristic as in Winkler 1999.
  
  @param score double
  @param S String
  @param T String
  @return double