Crypto Square

Challenge Overview

Implement the classic method for composing secret messages called a square code.

Visit the crypto-square exercise on Exercism to read the full instructions and download the exercise files.

Community Solutions

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Solution 1 by @masantoine (⭐ 0) — View on Exercism
Solution 2 by @marvelous (⭐ 0) — View on Exercism
Solution 3 by @tqa236 (⭐ 0) — View on Exercism

Source: Exercism cpp/crypto-square

💡 View Solution

namespace crypto_square {

std::string cipher::normalize_plain_text() {
	std::string an_mes, low_mes;
	std::copy_if(message_.begin(), message_.end(), 
			std::back_inserter(an_mes), isalnum);
	std::transform(an_mes.begin(), an_mes.end(), 
			std::back_inserter(low_mes), tolower);
	return low_mes;
}