Function flo_curves::bezier::overlapping_region

pub fn overlapping_region<C1: BezierCurve, C2: BezierCurve>(
    curve1: &C1, 
    curve2: &C2
) -> Option<((f64, f64), (f64, f64))> where
    C1::Point: Coordinate + Coordinate2D,
    C2: BezierCurve<Point = C1::Point>, 

If curve2 overlaps curve1, returns two sets of t values (those for curve1 and those for curve2)