/* Write the copy function to perform exactly as strncpy does, with one exception: your copy function will guarantee that dest is always null-terminated. Capacity is expected to be the number of bytes of memory allocated to dest. You shoud read the man page to learn how strncpy works. NOTE: You must write this function without using any string functions. The only function that should depend on string.h is memset. */ char *copy(char *dest, const char *src, int capacity) {