code: def cancel(self,order_id):
          ''' cancel the specified order
          :param order_id: order_id to be canceled
          '''
          url= 'https://coincheck.com/api/exchange/orders/' + order_id
          headers = make_header(url,access_key=self.access_key,secret_key=self.secret_key)
          r = requests.delete(url,headers=headers)
          return json.loads(r.textf cancel(self,order_id):
          ''' cancel the specified order
          :param order_id: order_id to be canceled
          '''
          url= 'https://coincheck.com/api/exchange/orders/' + order_id
          headers = make_header(url,access_key=self.access_key,secret_key=self.secret_key)
          r = requests.delete(url,headers=headers)
          return json.loads(r.text)
docs: cancel the specified order
          :param order_id: order_id to be canceled