The Caesar cipher is a quick and easy method of encryption. You can also see it's "big brother", the Vigenère cipher.
Compile with cc -Wall -Werror -Wextra main/main.c functions/ft_cipher.c
Syntax to use the code : ./executable_name
key_number
"plaintext"
Tip
This program encrypts the alphabetical characters : no worries for long text encryption !