λ ./double_transpose encode [first_key] [second_key] '[plaintext]'
λ ./double_transpose encode swag master 'whats your favorite color'
WHAUS YOVRF ATORI LECOO RT
λ ./double_transpose decode first_key second_key 'cipher_text'
λ ./double_transpose decode swag master 'WHAUS YOVRF ATORI LECOO RT'
WHATSYOURFAVORITECOLOR