Simple stack implementation using linked list in C.

stack.c

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

typedef struct Node Node;

struct Node{
int value;
Node* next;
};

struct Stack{
Node* last;
} stack = {NULL};

void Stack_push(int val);
void Stack_pop();

int main() {

    Stack_push(0);
    Stack_push(1);
    Stack_push(2);
    Stack_push(3);
    Stack_push(4);
    Stack_push(5);

    while(stack.last != NULL) {
        printf("%d\n", stack.last->value);
        Stack_pop();
    }

}

void Stack_push(int val) {
    Node* newNode = (Node*)malloc(sizeof(Node));
    newNode->next = stack.last;
    newNode->value = val;
    stack.last = newNode;
}

void Stack_pop() {
    Node* tmpNode = stack.last->next;
    free(stack.last);
    stack.last = tmpNode;
}