Using Prolog, Implement gas(point(X,Y)) that can return the closest gas station.

Gas station locations: X Y 1 1 1 2 1 3 2 1 2 2 3 1

Here is the code for calculating the distance between two points FYR. dist(point(X1,Y1), point(X2,Y2), Len) :- % DX is X1-X2, DY is Y1-Y2, Len is sqrt(DX*DX + DY*DY).

Test cases: ?- gas(point(2, 1)). X=2,Y=1 ?- gas(point(1, 1)). X=1,Y=1 ?- gas(point(1.6, 1)). X=2,Y=1 ?- gas(point(0, 0)). X=1,Y=1 ?- gas(point(3, 3)). X=2,Y=2