PCL point cloud processing to find the two endpoints of the line point set (57)

problem

Give a set of point clouds that conform to the linear distribution , Find the two endpoints at both ends of the line
I think of a stupid but usable method （ In fact, I think this method is really simple and good , I feel more fulfilled than anything I wrote before. Hahahaha ）, Here is the code and effect

Experimental code

#include <iostream>
#include <pcl/console/parse.h>
#include <pcl/filters/extract_indices.h>