Callbacks for complex FSM

[zivsha]

I'm new to this FSM so maybe there is already a solution for this case but anyways I'd appreciate the help.
Given the following FSM:

    A -->|Event1| B
    A -->|Event2| C
    B -->|Event2| C

How do I get a callback when transitioning from A to C only?
If I use enter_C": func(_ context.Context, e *Event) I will have to switch on e.Event inside, and same if I use leave_A.

Is there a way to request a callback like leave_A_enter_C or leave_A_before_Event2?

[supermigo]

before c ， get event is a pls do something

[supermigo]

在c之前，get event是一个A请做点什么