Modified code and question

#include<iostream>
#include<string>

template <typename T>
void swap(T a , T b)
{
    T temp = a;
    a = b;
    b = temp;
    std::cout<<"Myswap"<<std::endl;
}

template <typename T1>
void swap1(T1 a , T1 b)
{
    T1 temp = a;
    a = b;
    b = temp;
    std::cout<<"Myswap1"<<std::endl;
}


int main()
{
    int a = 10 , b = 20;
    std::string first = "hi" , last = "Bye";

    swap(a,b);
    std::cout<<"a = "<<a<<" b = "<<b<<std::endl;
    std::cout<<"------------------"<<std::endl;

    swap(first, last);
    std::cout<<"first = "<<first<<" last = "<<last<<std::endl;
    std::cout<<"------------------"<<std::endl;

    int c = 50 , d = 100;
    std::string name = "abc" , surname = "def";

    swap1(c,d);
    std::cout<<"c = "<<c<<" d = "<<d<<std::endl;
    std::cout<<"------------------"<<std::endl;

    swap1(name,surname);
    std::cout<<"name = "<<name<<" surname = "<<surname<<std::endl;
    std::cout<<"------------------"<<std::endl;


    swap(c,d);
    std::cout<<"c = "<<c<<" d = "<<d<<std::endl;
    std::cout<<"------------------"<<std::endl;

    swap(name,surname);
    std::cout<<"name = "<<name<<" surname = "<<surname<<std::endl;
    std::cout<<"------------------"<<std::endl;

return 0;
}
/*
https://stackoverflow.com/questions/61325323/trying-to-use-templatised-fuctions-to-swap-two-strings

Output:

Myswap
a = 10 b = 20
------------------
first = Bye last = hi
------------------
Myswap1
c = 50 d = 100
------------------
Myswap1
name = abc surname = def
------------------
Myswap
c = 50 d = 100
------------------
name = def surname = abc
------------------

Apparently it looks like swap1(name,surname); is called. But this is the only time it is called. Why is this the case?