#include <functional>
#include <iostream>
#include <map>
#include <string>
 
using namespace std;
 
void foo();
void foo2();
 
int main(){
    map<string, function<void()>> funcs{{"foo", foo},{"foo2", foo2}};
 
    string s;
    cin >> s;
 
    /*Take the input from cin and turn it into a function call, or some other
    form of runnable code, like so*/
 
	auto findIt = funcs.find(s);
	if (findIt != end(funcs)) (findIt->second)();
}
 
void foo(){
    cout << "Foo works, yay :D";
}
 
void foo2(){
    cout << "Foo2 works, yay :D";
}
 

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Zm9vCg==

foo