message: remove unecessary function: calculate_center_line
diff: @@ -317,28 +317,6 @@ inline bool Collide(const Line &l1, const Line &l2) {
  return !shape_intersect.empty();
  }
  -inline Line calculate_center_line(const Line& inner_line, const Line& outer_line) {
  - // select line with more points for looping to avoid resolution reduction
  - Line line_more_points = outer_line;
  - Line line_less_points = inner_line;
  - if ( inner_line.obj_.size() > outer_line.obj_.size() ) {
  - line_more_points = inner_line;
  - line_less_points = outer_line;
  - }
  -
  - Line center_line;
  - // TODO(@hart): use horizon
  - for ( Point2d& point_loop : line_more_points.obj_ ) {
  - Point2d nearest_point_other = geometry::get_nearest_point(line_less_points,
  - point_loop);
  - geometry::Point2d middle_point = (point_loop + nearest_point_other) / 2;
  - center_line.add_point(middle_point);
  - }
  -
  - return center_line;
  -}
  -
  -
  // An oriented point can have a linestring (the nearest point on it) on the left or right side, left side < 0, right side > 0
  inline double signed_distance(const Line &line, const Point2d &p, const float& orientation) {
  auto closest_point = get_nearest_point(line, p);
  