From ff0e21d42b43ff771dd1ba1a1b8440e35f378e95 Mon Sep 17 00:00:00 2001
From: Sambo Chea <sombochea@cubetiqs.com>
Date: Sun, 2 Aug 2020 19:42:42 +0700
Subject: [PATCH] Preform the linked list nodes Use free to clean up the memory

---
 work1/single.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/work1/single.c b/work1/single.c
index aa8821b..8266973 100644
--- a/work1/single.c
+++ b/work1/single.c
@@ -287,12 +287,23 @@ again:
     fclose(file);
 
     printf("\nSaved");
+
+    // reload data into linked list again
+    read_file();
 }
 
 void read_file()
 {
-    // init head to null
-    head = NULL;
+    // free the nodes
+    // because it can be use in memory
+    // we need to clear it first
+    // before we re-initailize the new data
+    STUDENT *temp;
+    while (head != NULL) {
+        temp = head;
+        head = head->next;
+        free(temp);
+    }
 
     FILE *file;
     file = fopen(FILE_STUDENT_DATA_PATH, "r");