Fixed error at course of marks

Updated for read file function

tests/work1.c

@@ -1,5 +1,6 @@
 #include "stdio.h"
 #include "string.h"
+#include "stdlib.h"
 
 struct person_tag
 {
@@ -37,5 +38,57 @@ int main()
     printf("Hello, %s \n", person2.name);
     printf("Hello Ptr, %s \n", personPtr->name);
 
+    // using linkedlist
+    struct student_tag *first = NULL;
+    struct student_tag *second = NULL;
+    struct student_tag *third = NULL;
+
+    first = (struct student_tage *)malloc(sizeof(struct student_tag *));
+
+    struct course_tag c1 = {"Computer", 4, {1, 2, 3, 4}};
+    struct person_tag p1 = {"Sambo", "121214"};
+    first->course_info = c1;
+    first->student_info = p1;
+    first->next = second;
+
+    printf("Student name: %s \n", first->student_info.name);
+    printf("Student id: %s \n", first->student_info.id);
+    printf("Course name: %s \n", first->course_info.course_name);
+    printf("Course of units: %d", first->course_info.no_of_units);
+
     return 0;
-}
+}
+
+void read_file()
+{
+    // read the file here...
+    FILE *file;
+    char c;
+
+    if ((file = fopen("./../data/welcome.txt", "r")) == NULL)
+    {
+        printf("no file were found...!");
+    }
+    else
+    {
+        while ((c = getc(file)) != EOF)
+        {
+            printf("%c", c);
+        }
+    }
+}
+
+void menu(int menu)
+{
+    // do something here...
+    switch (menu)
+    {
+    case 1:
+        printf("1. Student details...");
+        break;
+
+    default:
+        printf("No menu found here...!");
+        break;
+    }
+}