... The point structure denotes a point on the plane that is a part of a path. The structure includes a pointer to the next point on the path, or nullptr if it is the 14. last point of the path. Given the structure definition shown below, complete the function that computes the length of a path that starts with the given Point. pathlength.cpp 1 #include 2 using namespace std; 3 4 struct Point 5 { 6 double x; 7 double y; 8 Point" next; 9 }; 10 11 double path_length(Point* first) 12 { 13 double result = 0.0; 14 15 Point* p = first; 16 while (...) 17 { 18 Point* q-.. .; 19 if (...) 20 { 21 result = result + sqrt(...+...); 22 } 23 P = p->next; 24 } 25 26 return result; 27 } Tester.cpp 1 #include 2 using namespace std; 3 4 struct Point 5 { 6 double x; 7 double y: 8 8 Point * next; 9 }; 10 11 double path_length(Point* list); 12 13 Point* make_point (double x, double y, Point* next) 14 { 15 Point* result = new Point; 16 result->X = x; 17 result->y = y; 18 result->next = next; 19 return result; 20] 21 22 int main() 23 24 Point* e - make_point(0, 0, nullptr); 25 Point* d = make point(1, 0, e); 26 Point* c = make point(1, 1, d); 27 Point* b = make_point(0, 1, c); 28 Point* a = make_point(0, 0, b); 29 30 cout next)