code: public boolean cancelMFOrder(String orderId) throws KiteException, IOException, JSONException {
          KiteRequestHandler kiteRequestHandler = new KiteRequestHandler(proxy);
          kiteRequestHandler.deleteRequest(routes.get("mutualfunds.cancel_order").replace(":order_id", orderId), new HashMap<String, Object>(), apiKey, accessToken);
          return true;
      }
docs: If cancel is successful then api will respond as 200 and send back true else it will be sent back to user as KiteException.
  @return true if api call is successful.
  @param orderId is the order id of the mutualfunds order.
  @throws KiteException is thrown for all Kite trade related errors.
  @throws IOException is thrown when there connection related error.