share 2 patch for ack extension

[LeonCT]

hi： Thank you very much for the convenience of your excellent code framework.and I want to share 2 patch for ack extension. please review If code requirements are met.Thank you very much！

[marcinbor85]

besides of all above, all new features require add some basic unit tests or at least examples to show how to use it.

[LeonCT]

besides of all above, all new features require add some basic unit tests or at least examples to show how to use it.

Thank you for your improvement suggestions after the code review. I will revise it according to the suggestions and resubmit it. Please review it later.I really appreciate it！