Highest product of 3
Highest product of 3

For a given array of integers, provided function
will return highest product of 3 in O(n) time where
n is the length of the array.

Test cases included.

Signed-off-by: Usman <f401817b1c291151da1ecb86661bd58ff18aa46f@gmail.com>

usmanajmal/coding-practice,usmanajmal/coding-practice,usmanajmal/coding-practice