aas

void Substitution::swap(char i, char j){
    char temp = cipher[i];
    cipher[i] = guessCipher[j];
    guessCipher[j] = temp;
};

void Substitution::swap(char i, char j){
...
    int randomNumber1 = randomWithLimits('a', 'z');
    int randomNumber2 = randomWithLimits('a', 'z');
    for (int i = 0; i <= 1000; i++){
        randomNumber1 = randomWithLimits('a', 'z');
        randomNumber2 = randomWithLimits('a', 'z');
        swap(randomNumber1, randomNumber2);
    }
...

};