From 942770dbc9f6061283888359c22f5c604c3a52e5 Mon Sep 17 00:00:00 2001
From: heimoshuiyu <heimoshuiyu@gmail.com>
Date: Tue, 16 Mar 2021 21:06:00 +0800
Subject: [PATCH] stack dangling pointer after free stack

---
 week3/stack.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/week3/stack.c b/week3/stack.c
index 1c5d66d..dfc2fd8 100644
--- a/week3/stack.c
+++ b/week3/stack.c
@@ -102,6 +102,7 @@ void DisplayStack(Stack *stack) {
 
 void DestroyStack(Stack *stack) {
 	free(stack->data);
+	stack->data = NULL;
 	stack->size = 0;
 	stack->top = -1;
 }