Given a list of Integers in the following format x1, y1, x2, y2, x3, y3,...xN, yN for some N Cartesian points, find the closest distance between any two points. To avoid round off-error, round all answers to 4 significant digits. So a call to closestDistance([0,0,0,4]) would return 4.0 because the distance between point one(0,0) and point two(0,4) is 4.0.