flip

  Write a method called flip that takes a Random
   object and an integer n as parameters and that prints information about a
   coin-flipping simulation.  Your method should use the Random object to
   produce a sequence of simulated coin flips, printing whether each flip comes
   up "heads" or "tails."  Each outcome should be equally likely.  Your method
   should stop flipping when you see n heads in a row (where n is the second
   value passed as a parameter to the method).

   For example, if we construct a Random object and make the following calls:

        Random r = new Random();
        flip(r, 2);
        flip(r, 4);

   We expect to get output like the following:

        flips: H T T T T T T H H
        flips: H H T H T H T H H H T T T T T H T H H H H
        
   Notice that we abbreviate "heads" as "H" and "tails" as "T."  You must
   exactly reproduce the format of the log above, although the specific output
   produced will vary on different executions because of the use of the Random
   object to produce different sequences.  You may assume that the integer
   passed as a parameter to your method is greater than 0.