#include <iostream>
#include <string>

constexpr std::string appendStringC(std::string s)
{
    return s + " Constexpr func";
}

std::string appendString(std::string s)
{
    return s + " Regular func";
}

int main()
{
    std::string s1 = "String 1";
    std::string s2 = "String 2";
    std::cout << std::endl
              << appendStringC(s1) << std::endl
              << appendString(s2) << std::endl;
    return 0;
}