Ошибка multiple defenition

#include <iostream>
using namespace std;
 
//################### Class Deffinition ###########################
class Point
{
private:
   static Point *first;
   static Point *last;
   int x, y;
   Point* next;
   Point* prev;
 
public:
 
    Point(int, int);
    int GetX(){return x;}
    int GetY(){return y;}
    void SetX(int);
    void SetY(int);
    void print(){std::cout << "X: "<< x << "\nY: " << y << std::endl;}
    static void print_all();
 
 
};
Point* Point::first  = nullptr;
Point* Point::last = nullptr;
//#########################Class deffinition###################
 
 
 
//##################### Class realisation ###########################
/*Point::Point(int _x, int _y)
{
   if(first == nullptr && nullptr == last)
    {
        first = this;
        last=this;
        this->next = nullptr;
        this->last = nullptr;
    }
    else {
        this->prev = last;
        this->next = nullptr;
        last->next = this;
        last = this;
    }
 
    x=_x; y=_y;
 
 
 
}
void Point::print_all()
{
    Point * current = first;
    while (current->next)
    {
        current->print();
        std::cout << std::endl;
        current = current->next;
    }
}
void Point::SetX(int _x){x= _x;}
void Point::SetY(int _y){y = _y;}*/
//################################################### end realisation #######################3
int main()
{
    for (int i=0; i < 5; i++ )
    {
        int x,y;
        cout << "Введите Х: " ; cin >> x;
        cout << "Введите Y: " ; cin >> y;
        //new Point(x,y);
    }
    //Point::print_all();
    return 0;
}