private double wordcompare(word a, word b)
{
     if (a.AtTheEndOf(b))
         return -1;
     double matchPer=word.Compare( a,b);
     Console.WriteLine(matchPer);
     a.shiftToleft();
     double nextMatchPer = wordcompare(a, b);
     return matchPer > nextMatchPer ? matchPer : nextMatchPer;
}