code: def get_unique_name(self, name):
          
  
          if name not in self._db:
              self._db[name] = 0
              return name
          else:
              index = self._db[name]
              self._db[name] = index + 1
              return f"{name}_{index}"
docs: returns an available unique name
  
          Parameters
          ----------
          name : str
              name to be made unique
  
          Returns
          -------
          unique_name : str
              new unique name