feat(codes/c): update linkedlist_stack.c some code

codes/c/include/print_util.h

@@ -127,6 +127,14 @@ static void printTree(TreeNode *root) {
     printTreeHelper(root, NULL, false);
 }
 
+/**
+ * @brief Print a stack
+ *
+ * @param head
+ */
+static void printStack(void *stack) {
+    
+}
 
 #ifdef __cplusplus
 }