#include <stdio.h>
void fe_CompressGIF(char c[], char gif[]);
void fe_ExpandGIF(char c[], char gif[]);
main() {
  char str[255] = "aaabbbccdeefffgggg";  // pocetni string
  char sc[255];                          // string koji ce sadrzati znakove i broj istih
  int  i = 0;
  printf("%s\n------\n", str);
  fe_CompressGIF(str, sc);

  fe_ExpandGIF(str, sc);
  printf("------\n%s\n", str);
}

void fe_CompressGIF(char c[], char gif[]) {
  int i = 1; int count = 0; int k = 0;
  char cc = c[0]; // trenutni znak
  while (c[i] != 0) {
    if (cc == c[i]) {
      count++;
    } else {
      gif[k] = cc;
      gif[k+1] = count + 1;
      count = 0;
      k += 2;
    }
    cc = c[i];
    i++;
  }
  gif[k] = cc;
  gif[k+1] = count + 1;
  gif[k+2] = 0;
}

void fe_ExpandGIF(char c[], char gif[]) {
  int i = 0; int x = 0; int ind = 0;
  while (gif[i] != 0) {
    for (x = 0; x < gif[i+1]; x++) {
      c[ind] = gif[i]; ind++;
    }
    i+=2;
  }
  c[ind] = 0;
}