void countChar() {
    int count = 0;
    for (int i = 0; i < strlen(str); i++) {
        if (!str[i])
            continue;
        for (int j = i + 1; j < strlen(str); j++) {
            if (str[i] == str[j]) {
                count++;
            }
        }
        printf("\n %c occurs : %d times", str[i], count);
        count = 1;
    }
}