char* generateStr(int size) {
    srand(time(NULL));
    int number;
    char* str = new char[size + 1];
    char a[52] = { 'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z', 'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z' };

    for (int i = 0; i < size; i++) {
        number = rand() % 7;
        if (number == rand() % 7) {
            str[i] = ' ';
        } else {
            str[i] = a[rand() % 52];
        }
    }
    str[size] = '\0';
    return str;
}