extern void *memset(void *dest, int val, size_t count);
extern void *memcpy(void *dest, const void *src, size_t count);
extern void *memmove(void *dest, const void *src, size_t count);
extern void *memset(void *dest, int val, size_t count);
extern void *memcpy(void *dest, const void *src, size_t count);
extern void *memmove(void *dest, const void *src, size_t count);