feat: update structure

cs2106/labs/lab4/bitmap/harness.c

@@ -0,0 +1,52 @@
+#include <stdio.h>
+#include <assert.h>
+#include "mymalloc.h"
+
+void *runmalloc(size_t len, long expected_ndx) {
+
+    long ndx;
+    void *ptr;
+
+    printf("Allocate %ld bytes.\n", len);
+    printf("Before: ");
+    print_memlist();
+    ptr = mymalloc(len);
+    printf("After:  ");
+    print_memlist();
+    ndx = get_index((void *) ptr);
+    printf("\n");
+    assert(ndx == expected_ndx);
+    return ptr;
+}
+
+void runfree(void *ptr) {
+    printf("Free\n");
+    printf("Before: ");
+    print_memlist();
+    myfree(ptr);
+    printf("After:  ");
+    print_memlist();
+    printf("\n");
+}
+
+int main() {
+    
+    void *ptr1, *ptr2, *ptr3, *ptr4, *ptr5;
+
+    ptr1 = runmalloc(4, 0);
+    ptr2 = runmalloc(32, 4);
+    ptr3 = runmalloc(2, 36);
+    runfree(ptr2);
+    ptr2 = runmalloc(12, 4);
+    ptr4 = runmalloc(24, 38);
+    ptr5 = runmalloc(18, 16);
+    runfree(ptr1);
+    ptr1 = runmalloc(2, 0);
+    runfree(ptr1);
+    runfree(ptr2);
+    runfree(ptr3);
+    runfree(ptr4);
+    runfree(ptr5);
+}
+
+