en/de-code string

/*
Result:

 String entered: AAABBCAABDDAFF
 String encode: 3A2B1C2A1B2D1A2F
 string decode: AAABBCAABDDAFF

 */

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

int main()
{
    char str[]="AAABBCAABDDAFF";

    char str_encode[strlen(str)];
    int count=1,i,j=0;
    //encode
    printf("\n String entered: %s",str);
    printf("\n String encode: ");
    for(i=0;i<=strlen(str)-1;i++){
        if(str[i] == str[i+1]){
             count++;
        }else{
            str_encode[j++] = count;
            str_encode[j++] = str[i];
            printf("%d%c",count,str[i]);
            count=1;
            }
    }

    //decode
    int temp;
    printf("\n string decode: ");
    for(i=0;i<=j-1;i+=2){
            int f;
            for(f=0;f<=(int)str_encode[i]-1;f++){
                printf("%c",str_encode[i+1]);
            }
    }

    return 0;
}