============
||main.cpp||
============

string name;
int birth_year, age;
std::cin >> name >> birth_year >> age;
PrintBirthday(name, birth_year, age);


=================
||functions.cpp||
=================

#include <iostream>
#include <string>

using namespace std;

void PrintBirthday(const string& name, int birth_year, int age){
    cout << name << " will turn " << age << " in " << age+birth_year << endl;
    if(age % 50 == 0 && age % 10 == 0){
        cout << "Happy great anniversary!" << endl;
    }
    else if(age % 10 == 0){
        cout << "Happy anniversary!" << endl;
    }
    else
        cout << "Happy birthday!" << endl;
}