review hw02-soln; `while` intro

      padRight( String s, int desiredLen )  {
         String paddedSoFar;
         paddedSoFar = s;
         if (...) {
             paddedSoFar = paddedSoFar + ".";
             }
         // else we're done;    
         return paddedSoFar;
     }
         
         
      testPadRight( String s, int desiredLen ) {
          assertEquas( padRight("hi",5),  "hi..." );
      }