Write a subroutine in Fortran to ascertain whether three points are collinear. Collinearity of three points (x1, y1), (x2, y2), and (x3, y3) can be determined using the following formula: Collinearity formula: (x2-x1) * (y3-yl) - (x3 - x1) * (y2-yl)=0 The subroutine will take the coordinates of the three points (x1, y1), (x2, y2), and (x3, y3) as inputs and will return a logical value. If the points are collinear, the subroutine should return true; otherwise, it should return false. Additionally, develop a main program that prompts the user to input the coordinates of the three points. After calling the subroutine to check collinearity, the main program should print an appropriate message indicating whether the points are collinear or not.