feat: update structure

cs2106/labs/lab1/part3/lab1p3b.c

@@ -0,0 +1,9 @@
+#include <stdlib.h>
+#include <stdio.h>
+
+int main() {
+    int *p = (int *) malloc(sizeof(int));
+    *p = 5;
+    printf("p is %p and *p is %d\n", p, *p);
+    free(p);
+}