code: public String getStatistics() {
          StringBuilder sb = new StringBuilder();
          
          for(String key : stats.keySet()) {
              sb.append(key);
              sb.append(": ");
              sb.append(stats.get(key));
              sb.append("\n");
          }
          
          return sb.toString();
      }
docs: Returns a string with all the current statistics.
  @return