Implement Stack Using Array with Push and Pop Operations

#include <stdio.h>
#include <stdint.h>
#include <string.h>

#define MAX 10

typedef struct {
    int buffer[MAX];
    int index;
} my_stack;

my_stack stk = {.index = -1};

void push_stack(my_stack *stk, int x) {
    if (stk -> index == MAX - 1) {
        printf("Stack Overflow\n");
        return;
    } else {
        stk -> index++;
        stk -> buffer[stk -> index] = x;
    }
};

void pop_stack(my_stack *stk) {
    if (stk -> index == -1) {
        printf("Stack Underflow\n");
        return;
    } else {
        printf("%d\n", stk -> buffer[stk -> index]);
        stk -> index--;
    }
};

void process_stack(int n) {
    // Your logic here
    while (n--) {
        char cmd[10];
        scanf("%s", cmd); //fgets(cmd, sizeof(cmd), stdin);
        if (strcmp(cmd, "push") == 0) {
            int x; scanf("%d", &x);
            push_stack(&stk, x);
        } else if (strcmp(cmd, "pop") == 0) {
            pop_stack(&stk);
        } else return;
    }
}

int main() {
    int n;
    scanf("%d", &n);
    getchar(); // Consume newline after number

    process_stack(n);
    return 0;
}