Modify the end of one curve until it matches the position, tangency, or curvature of another.

Input parameters:

1. Cm → Curve to modify.
2. Cg → Guide curve for matching.
3. Mc → Desired continuity at matching end.
   • 0 → Position
   • 1 → Tangency
   • 2 → Curvature
   • 3 → G3
   • 4 → G4
4. Pc → Level of continuity to preserve at opposite end.
   • 0 → None
   • 1 → Position
   • 2 → Tangency
   • 3 → Curvature

Output parameters:

1. Cm → Modified curve matching the guide curve.