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int do_auth(void) {
  char username[MAX_USER], password[MAX_PASS];

  puts("Please enter your username: ");
  fgets(username, MAX_USER, stdin);
  puts("Please enter your password: ");
  fgets(password, MAX_PASS, stdin);

  if (!strcmp(username, "user") && !strcmp(password, "password")) {
    return 0;
  }
  return -1;
}

void log_error(char *msg) {
  char *err, *mesg;
  char buffer[24];

  sprintf(buffer, "Error: %s", mesg);
  printf("%s\n", buffer);
 }

int main(void) {
  if (do_auth() == -1) {
    log_error(ERR_CRITIC | ERR_AUTH, "Unable to login");
  }
  return 0;
}