how to pass arbitrary array of structs to a function?

I am trying to pass arbitrary array of structs to a function. It compiles well but it prints nothing. Here is the arbitrary array of structs: aFriend *p_array=new aFriend[index]; The function call updateTalk(p_array, index); and the function void updateTalk(aFriend an_array[], int a_size)

Also here is the whole code:

#include <iostream>

using namespace std;

struct aFriend
{
    string name;
    int days_ago=0;
};

aFriend addFriend(int& index)
{
    aFriend newFriend;
    cout<<"Enter friend's name:\t";
    cin>>newFriend.name;
    do{
    cout<<"How many days ago you talked with him/her:\t";
    cin>>newFriend.days_ago;
    } while (newFriend.days_ago<=0);
    index++;
    return newFriend;
}

void updateTalk(aFriend an_array[], int a_size)
{
    cout<<"an_array[0].name="<<an_array[0].name<<endl;
    cout<<"Select one of the following names:\n";
    for(int i=0;i<a_size;i++)
    {
        cout<<"1. "<<an_array[i].name;
    }
    cout<<endl;
}

void printList()
{

}
int index=0;
int main()
{
    cout<<"1. Add friend\n2. Update last talk\n3. Print list\n4. Exit\n";
    int pick;
    cin>>pick;
    aFriend *p_array=new aFriend[index];
    switch (pick)
    {
        case 1: addFriend(index);return main();
        case 2: updateTalk(p_array, index); return main();
        case 3: printList(); return main();
        case 4: return 0;
        default: cout<<"Error! Please select one of the available options!\n"; return main();
    }
}