3 char *my_mmap(int len, int fd);
5 void reverse(unsigned char *dest, unsigned char *from, int len);
6 void my_qsort(unsigned char *base, size_t size);
7 void intersperse(unsigned char *dest, unsigned char *from, int len, char c);
8 unsigned char maximum(unsigned char *p, int len);
9 unsigned char minimum(unsigned char *p, int len);