How To Trim Cyclic Splines In Blender Geometry Nodes

Until now Blender Geometry Nodes have no way to trim a cyclic spline. Setting the spline to non-cyclic creates a gap and it's not pretty. I found a solution to close that gap using the same geometry nodes calculations. Hope this helps anyone who seeks perfection. Detailed explanations are included in the file. Blender 3.1 and up.