I have a problem whit the extrude feature
Nearly same solution like above.
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Step 1:
Delete Sketch 6 - unnecessary
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Step 2:
Just delete Curve2
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Step 3:
Delete 3D Sketch
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Step 4:
Edit Sketch 5 to have it symmetrical (for the nice shape)
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Step 5:
Use the Sketch 5 to create spline line
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Step 6:
Use the spilte line to create Offset Surface (20 mm is for example)
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Step 7:
Use the Cut Thicken to have it removed, that's it...