feat: update structure

cs2106/labs/lab4/linkedlist/pb/mymalloc.h

@@ -0,0 +1,7 @@
+#include <stdio.h>
+#define MEMSIZE 64 * 1024 // Size of memory in bytes
+
+long get_index(void *ptr);
+void print_memlist();
+void *mymalloc(size_t);
+void myfree(void *);