public static StringDistanceEvaluator GetInstance()
 {
     if (INSTANCE == null)
         INSTANCE = new StringDistanceEvaluator();
     return INSTANCE;
 }
 public static int ComputeDistance(string a, string b)
 {
     if (INSTANCE == null)
         INSTANCE = new StringDistanceEvaluator();
     return FuzzySearch.LevenshteinDistance(a, b);
 }