$1.$ The exhange function does not work properly. Its task is to exchange two variables

Find, fix, and briefly explain the errors.

void exchange $($ ORDER b$1,$ ORDER b$2)$

$\{$

ORDER hold;

hold $=$ b$1$;

b$1=$ b$2$;

b$2=$ b$1$;

$\}$

$2.$ Use the exhange function $($defined and corrected above$)$ to randomize a list of books.

The function must use random numbers: generate a random number in the range

$0$ to size $1$ then exchange the current book with the book in the random position.

void unsort $($ORDER list$[],$ int size $)$

$\{$