Reverse engineering characters to ascii

so i've got code (see below) turns characters ascii, works great want make turns ascii characters i'm completly lost. if tell me how modify code or me (i wont mind ) great.

code: [select]

void setup()

{
  serial.begin(9600);

  char string[] = "abd";
  char buffer[4 * sizeof(string)];
  char* buffptr = buffer;

  (byte = 0; < sizeof(string) - 1; i++) {
    itoa((int)string[i], buffptr, 10);
    buffptr += strlen(buffptr);
    *buffptr = ' ';
    buffptr++;
  }
  buffptr--;
  *buffptr = '\0';
  serial.println(buffer);

}

void loop()

{

}

in code above use itoa() convert int ascii


you can use opposite function atoi() go other way

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