int main(int argc, char* argv[]){
  
  char sentence1[] = "Hello world blah blah.";
  reverse(sentence1);
  
  char sentence2[] = "Hello world blah blah.";
  fill_spaces(sentence2, 'a' );
  
  int a = 4;
  int b = 7;
  swap_no_temp(a,b);
  
  int result;
  
  result = multiply_without_mult(a,b);
  printf("Result of %d * %d is %d \n", a, b, result);
  
  palindrome("racecar");
  palindrome("hello");
  
  unique_char("google");
  unique_char("gole");
  
  
  return 0;
}
int main() {
    if (0 == data_input("input.txt")) {
        result = unique_char(str_src);
        if (0 == data_output("output.txt")) {
            return 0;
        }
    }
    return 1;
}