Decrypts a ciphertext string using the Vernam cipher. The function converts all input to uppercase and works only with letters A-Z. The key is repeated cyclically if it's shorter than the ciphertext. # Arguments `ciphertext` - The text to decrypt (will be converted to uppercase) `key` - The decryption key (will be converted to uppercase, must not be empty) # Returns The decrypted plaintext as
(ciphertext: &str, key: &str)
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