memmove - copy memory area
#include <string.h>
void *memmove(void dest[.n], const void src[.n], size_t n);The memmove() function copies n bytes from
memory area src to memory area dest. The memory areas
may overlap: copying takes place as though the bytes in src are
first copied into a temporary array that does not overlap src
or dest, and the bytes are then copied from the temporary array
to dest.
The memmove() function returns a pointer to
dest.