Why this code doesn’t work? It should write vertical an int

Question

This is the code:
#include <iostream>
using namespace std;
void write_vertical(int n){
if(n<10){
cout<<n<<endl;
}
else{
return write_vertical(n/10);
cout<<n%10<<endl;
}
}
int main()
{
int n;
cin>>n;
cout << "start" << endl;
stampa_verticale(n);
cout << "end" << endl;

}
There is the code, where there is the recursive function write_vertical. It should get a integer number from the input and print the number in vertical form; for example 123 should be printed
1
2
3.

Answer 1

Probably because in main you are calling a function named stampa_verticale and not write_vertical.

Answer 2

https://code.sololearn.com/cvVX8LlOHfv3/?ref=app