#include <stdio.h>

// sfp = pointer to function that returns char* and takes char* as arg
typedef char* (*sfp)(char *s);

// sf = function that returns char* and takes char* as arg
typedef char* (sf)(char *s);


char* f1(char *s) {
    printf("f1: %s\n", s);
}

char* f2(char *s) {
    printf("f2: %s\n", s);
}

main(int argc, char *argv) {

    sfp sfp1, sfp2;
    sf *sf1, *sf2;

    sfp1 = f1;
    sfp2 = f2;

    sfp1("alice");
    sfp2("bob");

    sf1 = f1;
    sf2 = f2;

    sf1("charlie");
    sf2("david");


}