public function askYesNo(string $prompt)
    {
        $prompt .= ' (y/n): ';
        $result = null;

        $result = $this->askUntillValid($prompt, function($answer) {
            /* Lowercase user prompt */
            $answer = strtolower($answer);

            /* Correrct answer is y or n */
            return $answer === 'y' || $answer === 'n';
        });

        return $result === 'y';
    }