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

// --------------------------------------------------
// Compute the sum of the ascii values of all
// the characters in the string
int total(char *my_string) {

    int total = 0;
    int i = 0;

    // We don't expect strings to be longer than 10000 characters
    while ( i < 10000 ) {

        total += my_string[i];
        i++;

    }

    return total;
}

// --------------------------------------------------
// Take a string as input
// Return the reversed string
char* reverse(char *my_string) {

    // Let's create the string that we will return and initialize it
    // to the empty string
    char *new_string = "";

    // Let's iterate over the string that we were given in reverse
    // and write the output to the new string
    int src = strlen(my_string)-1;
    int dst = 0;
    while ( src > 0 ) {
        new_string[dst] = my_string[src];
        dst++;
        src--;
    }

    // Return the reversed string
    return new_string;

}


// --------------------------------------------------
int main(int argc, char* argv[]) {

  if ( argc < 2 ) {
    printf("Please enter a string\n");
    return 1;
  }

  char *string_to_reverse = argv[1];

  // Step 1: Compute the sum of all ascii values
  int sum = total(string_to_reverse);
  printf("Sum of ascii values is %d\n",sum);

  // Step 2: Reverse the string
  char *reversed_string = reverse(string_to_reverse);

  // Step 3: Calling total on reversed string
  sum = total(reversed_string);
  printf("Sum of ascii values is %d\n",sum);
  
  printf("Original string %s\n",string_to_reverse);
  printf("Reversed string %s\n",reversed_string);
  
  return 0;
}