code: public String getDatabase() {
          int indexSlash = url.indexOf("/", url.indexOf("://") + 3);
          int questionMarkIndex = url.indexOf("?");
          if (questionMarkIndex != -1) {
              return url.substring(indexSlash + 1, questionMarkIndex);
          } else {
              return url.substring(indexSlash + 1);
          }
      }
docs: parse the databse url and get he database name
  
  @return the database name