code: def get_all_children(self, fullname: str) -> List[Account]:
          
          # find the account by fullname
          root_acct = self.get_by_fullname(fullname)
          if not root_acct:
              raise NameError("Account not found in book!")
  
          acct_agg = self.get_account_aggregate(root_acct)
          result = acct_agg.get_all_child_accounts_as_array()
          # for child in root_acct.children:
          #     log(DEBUG, "found child %s", child.fullname)
          return result
docs: Returns the whole child account tree for the account with the given full name