array_exercise.d creates an NxN rectangular boolean array. a[i][j] is true iff i and j are coprime.
Add stub files for  bag, queue and stack ADTs. Also implement Dijkstras shunting algorithm for fully parenthesized expressions.
implement a fixed size stack with a static array
Change the FixedStack class to use resizing instead of a static array.
change FixedStack => ArrayStack