diff --git a/data/students.test.txt b/data/students.test.txt
index f282c1a..210c480 100644
--- a/data/students.test.txt
+++ b/data/students.test.txt
@@ -26,4 +26,9 @@ SS3
 3
 5
 3
+2
+SS
+SS
+SS
+1
 2
\ No newline at end of file
diff --git a/work1/single.c b/work1/single.c
index fb3138a..1f778b4 100644
--- a/work1/single.c
+++ b/work1/single.c
@@ -1,5 +1,6 @@
 #include "stdio.h"
 #include "stdlib.h"
+#include "string.h"
 
 #define BUFFER_SIZE 128
 #define MAX_NO_OF_UNITS 4
@@ -157,11 +158,11 @@ void add_student(char student_name[20], char student_id[10], char course_name[20
     STUDENT *temp, *iterator;
     temp = (struct student_tag *)malloc(sizeof(struct student_tag));
     PERSON info;
-    strncpy(info.name, student_name, 20);
-    strncpy(info.id, student_id, 10);
+    memcpy(info.name, student_name, 20);
+    memcpy(info.id, student_id, 10);
 
     COURSE course;
-    strncpy(course.course_name, course_name, 20);
+    memcpy(course.course_name, course_name, 20);
     course.no_of_units = no_of_units;
     // memcpy(course.marks, marks);