Fillet an entire curve using a single radius.

Input parameters:

1. Cr → Curve to fillet.
2. Rd → Fillet radius.
3. Bn → Fillet bends whose curvature exceeds the filleting radius.
   •  True → Bends
   • False → Kinks
4. En → Fillet the open ends of the curve if their curvature exceeds the filleting radius.
   •  True → Ends
   • False → Interior

Output parameters:

1. Cr → Filleted curve.