How to Line overlap ignore first/last point ?

[volkanciloglu]

I draw lines on the main line. there may be more than one line above the main line. When a new line is drawn to the main line, it should not overlap with the other lines. I can do this with @ turf / line-overlap. but the problem is that I added snap to this drawing. The line overlap should be false when the other drawn lines snap to the first point and the last point. how to ignore the first and last points.

added codepenlink