Check whether the string contains a character - C

/*
Example: check if string contains a character in C language
*/

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>
#include <stdbool.h>

int main(int argc, char *argv[]) {
  char str[] = "Hi,lautturi world.";

  if(strchr(str, 'a') != NULL)
  {
     printf("a was found in the string \n");
  }

  return 0;
}