feat: update structure

cs2106/labs/lab4/linkedlist/mymalloc.c

@@ -0,0 +1,25 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include "mymalloc.h"
+
+char _heap[MEMSIZE] = {0};
+TNode *_memlist = NULL; // To maintain information about length
+
+// Do not change this. Used by the test harness.
+// You may however use this function in your code if necessary.
+long get_index(void *ptr) {
+    if(ptr == NULL)
+        return -1;
+    else
+        return (long) ((char *) ptr - &_heap[0]);
+}
+
+// Allocates size bytes of memory and returns a pointer
+// to the first byte.
+void *mymalloc(size_t size) {
+}
+
+// Frees memory pointer to by ptr.
+void myfree(void *ptr) {
+}
+