char[] str = "foo-bar";
memcpy(&str[3],&str[4],4); //might blow up

memmove(&str[3],&str[4],4); //fine

int SIZE = 100;
Item *ptr_item = (Item *) malloc(size_of(Item) * SIZE);
Item *ptr_src_item = ptr_item + 1;
Item *ptr_dst_item = ptr_item;
memmove(ptr_dst_item, ptr_src_item, SIZE - 1);

int SIZE = 100;
Item *ptr_src_item = (Item *) malloc(size_of(Item) * SIZE);
Item *ptr_dst_item = (Item *) malloc(size_of(Item) * (SIZE - 1));
memcpy(ptr_dst_item, ptr_src_item, SIZE - 1);