Why isn't the function called inside the click() event?

Question

JavaScript

Greetings. Here is the lamer jquery code for consideration.
In this code, I implemented two main events: a click on the sandwich and a shadow that appears and dims the entire site after clicking on the sandwich.
Sandwich clicks and shadow clicks should do the same thing, and in order not to copy sandwich click events into shadow clicks, I created a function for the sandwich event. But the function doesn't want to be called ("navEvents() is not defined"(c) - Console) when the shadow is clicked.

//Sandwitch click
    sandwitch.click(function(){
        function navEvents() {
            sandwitch.toggleClass('open');//Burger animation
            shadowCover.fadeToggle();//Shadows appearance,
            moveOutNav.toggleClass('add-shadow');
            $('.container').toggleClass('open-sidebar');//Nav appearance

            if($(document).width() <= 768) {//If less than 768px, red strap fades and resize burger
                redPartners.fadeToggle();
                sandwitch.toggleClass('marg-top');
                sandwitchPease.toggleClass('height-up');
            }

            if(docWidth > 768 && docWidth < 1366) {//Resized red strap
                if(redPartners.width() == 752) {
                    redPartners.animate({
                        width: 500
                    }, 400);
                } else {
                    redPartners.animate({
                        width: 752
                    }, 400);
                }
            }
        }
        navEvents();
    });

    //Shadow click
    shadowCover.click(function() {
        navEvents();
    });

I am not a master of wording, but I tried to explain as clearly as possible. To put it even simpler:
The click event on the sandwich is fired, i.e. the menu slides out, the sandwich turns into a cross. And this is all the navEvents() function that I called in the click event.
But I cannot connect the same function for clicking on the shadow, the console swears that navEvents(), that is, the function is not defined.

Answer 1

так она и не определена.
вернее она определена, но видит ее только сендвич.

Answer 2

1. прочитать хотя бы это: https://learn.javascript.ru/global-object,
а лучше ещё вот это: https://learn.javascript.ru/closures
2. сделать выводы