void * function pointer

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <pthread.h>
#include <time.h>
#include <unistd.h>


void test(char *msg) ;
void testInt(int n);
char *resMsg(char *msg);


int main() {
    char *s = "hello ";
    int n = 222;
    void* (*func)(void*);

    func = resMsg;
    char *t = func(s);
    printf("t:%s\n",t);

    func = testInt;
    func(n);


    func = test;
    func(s);

    return 0;
}

char *resMsg(char *msg) {
    char *name = "guanxianseng";
    char *buff = malloc(strlen(msg) + strlen(name));
    memset(buff, 0, sizeof(buff));
    sprintf(buff, "%s%s", msg, name);

    return buff;
}

void testInt(int n) {
    printf("n:%d\n", n);
}

void test(char *msg) {
    printf("msg:%s\n", msg);
}