int period(char str[]){
    int length = sizeof(str) / sizeof(char);
    int i,j,k,l;
    int period = length;
    // iterating each char in main string, except first char
    for (i=1; i<length/2; i++){
        if(str[i] == str[0]){
            int lengthDifference = i-1;
            bool check = false;
            if (lengthDifference+i <= length-1){
                check = true;
            }
            if (check){
                int tempPeriod = j+1;
                if (length%tempPeriod == 0){
                    int reps = length / tempPeriod;
                    bool checkReps = true;
                    for (k=1; k< reps-1; k++){
                        if (checkReps){
                            for (l=0; l<tempPeriod; l++){
                                if (str[l] != str[reps*tempPeriod + l]){
                                    checkReps = false;
                                    break;
                                }
                            }
                        }
                    }
                    if (checkReps){
                        period = tempPeriod;
                        break;
                    }
                }
            }
        }
    }
    return period;
}