#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <assert.h>

// 3 BUGS in stack_push(…)

typedef struct _Node {
    char ch;
    struct _Node* next;
} Node;

void stack_push(Node** a_top, char ch) {
    Node* new_top = malloc(sizeof(*a_top));  // NO (Node)malloc(…)!  NO sizeof(Node)!
    *new_top = (Node) { .ch = ch, .next = NULL };  // Compound literal
    if(*a_top == NULL) {  // if the stack is intially empty
        *a_top = new_top;
    }
    else {
        (*a_top) -> next = new_top;  // make the old top refer to the new top
        *a_top = new_top;
    }
}

int main(int argc, char* argv[]) {
    Node* top = NULL;  // empty stack
    stack_push(&top, 'A');

    return EXIT_SUCCESS;
}
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