Spline between two curves

Is this possible using rhino?

Yes it is named tween curve


i am trying to get a centre line in this font without having to draw it manually, and because of the difference in thickness between curves, is this possible?

Search for medial axis

Hello
Yes you have to search for medial axis.

But when you ask question please be more clear you first asked for 2 open curves and now it is a single closed curve.

thank you very much. this is my first post, i will know better next time. appreciate the help