found working method to calc min distance between skew line segments
add n.def. exception check to calc min distance between skew line segments
finished skew line segment minimal dist calc, next steps: more testcases and impl of min dist calculation 4 parallel line segments
refactored pointOfLineIsInSegment method and implemented first part of min dist of parallel line segments
refactoring: extracted minimal distance calculation of non intersecting segments lying on intersecting lines ; added conditionals to method to be able to use it for minimal distance calculation of parallel line segments