code: public static String createStringFromPoolInfo(PoolInfo poolInfo) {
      if (poolInfo == null) {
        return null;
      }
  
      return createValidString(poolInfo.getPoolGroupName(), poolInfo.getPoolName());
    }
docs: Create a single string from a {@link PoolInfo} object
  @param poolInfo Pool info
  @return Pool group joined to pool name with a '.'.  If missing a pool
  (only pool group, then no dot)