#include<stdio.h>
#include<stdlib.h>
#define MAX_STR_LEN 1024

// DO NOT USE the string library <string.h> for this exercise

void stringLength(char *str, int *len)
{
  int counter = 0;
  char letter = *(str + counter);

  while(letter != '\0')
  {
    counter++;
    letter = *(str+counter);
  }
  *len = counter;
}

void wordSwapper(char *source, char *destination)
{
  // This function takes a pointer to a 'source' string (an array
  // of chars, with maximum size MAX_STR_LEN), and
  // makes a new string inside the 'destination' string
  // (which is also passed as a pointer) so that the order
  // of the words in the destination string is the reverse
  // of the order in the source string.
  //
  // e.g. if:
  // The 'surce' string contains "Hello I Am A String!"
  //
  // then the destination string will contain
  //
  // 'String! A Am I Hello"
  // (notice that we add a space between each word in the
  // destination string - these are *added*, not *copied*)
  //
  // The only character to be used in separating words is
  // a blank space, so any other characters are considered
  // part of a word, for example "Hello, I; Am! A. *String*"
  // will becoe "*String* A. Am! I; Hello,"
  //
  // You *MUST* use pointers and pointer addressing to complete
  // this exercise (that is, no array notation with brackets []),
  // and you can not assume the 'destination' string is empty,
  // it could (and likely does) contain junk.
  //
  // If you decide to write helper functions, make sure they
  // are placed *above* this function's code.

  // TO DO: Complete this function
  destination[0] = '\0';

  int len1 = 0;
  stringLength(source, &len1);
  printf("Source is %d characters long\n",len1);

  for (int i=len1-1; i>=0; i--){
    if(source[i] == ' '){
      source[i] = '\0';

      printf("%s ", &(source[i]) + 1);
      //destination[] = &(source[i]) + 1;
    }
  }
  printf("%s \n", source);
  //destination[] = source;

}

#ifndef __TESTING
int main()
{
    char source[MAX_STR_LEN]="silence .is a looking bird:the turning; edge, of life. e. e. cummings";
    char destination[MAX_STR_LEN]="I am a destination string and I contain lots of junk 1234517265716572@qsajdkuhasdgsahiehwjauhiuiuhdsj!";

    printf("The original string is: \n%s\n",source);

    // Call word swapper with the address of the first character in 'source' and the first character in 'destination'
    wordSwapper(&source[0],&destination[0]);
    // You could also call wordSwapper like this: wordSwapper(source,destination) since, as we will have seen in
    // lecture this week, the array's name can be used to pass into a function the address of the first entry
    // in the array.

    printf("Destination string after swapping: \n%s\n",destination);
}
#endif