• void * mm_malloc(size_t sz)
• void mm_free(void *ptr)
• mm_realloc(void * ptr, size_t sz)

but mm_init is called first and then these call other functions. You may also need to add some functions and some macros!

• int mm_init(void)
• void *find_fit(size_t asize)
• void place(void *bp, size_t asize)
• void *extend_heap(size_t words)
• void *coalesce(void *bp)
• void mm_checkheap(int verbose)