heap.h modify

Heap/heap.h

+#ifndef _HEAP_H_
+#define _HEAP_H_
 #include <stdio.h>
 
 #define MAX_ELEMENT 200
@@ -16,3 +18,5 @@ void init(HeapType* pH);
 element delete_max_heap(HeapType *pH);
 
 void insert_max_heap(HeapType* h, element item);
+
+#endif