return value type does not match the function type

**main.cpp

#include <iostream>

#include "person.hpp"



int main(void) {
    /** Person class constructor. Two arguments: name and birthyear **/

    // Here objects are created from the class "Person"
    Person mrX("mr X", 2000);

    std::cout << mrX.GetName() << " is " << mrX.GetAge(2022) << " years old." << std::endl;
}

---------------------------------------------------------

**person.hpp

#ifndef CITIZENS_CPP_PERSON
#define CITIZENS_CPP_PERSON
#include <string>
// define your Person class here

class Person {         // Name of the class
    public:            // Access specifier
    
    void GetName(std::string name);
    void GetAge(int birthyear);
  
};

#endif

---------------------------------------------------------

**person.cpp

#include "person.hpp"
#include <iostream>
#include <string>

// define your Person class' functions here
void Person::GetName(std::string name) {
  return name;
}

void Person::GetAge(int birthyear) {
  return birthyear;
}