Replace existing fillet arcs with either chamfer lines or blend curves.

Input parameters:

1. Cr → Curve whose fillets to replace.
2. Ty → Replacing curve type.
   • 0 → Line
   • 1 → Corner
   • 2 → TangencyBlend
   • 3 → CurvatureBlend

Output parameters:

1. Cr → Modified curve.
2. Fl → Removed fillet arc segments.
3. At → Replacing segments inserted into curve.