Function affine_decrypt

Decrypts a message using the affine cipher. # Arguments `key` - The decryption key (same as encryption key) `message` - The ciphertext message to decrypt # Returns `Ok(String)` with the decrypted message, or `Err(String)` if keys are invalid # Example ``` use the_algorithms_rust::ciphers::affine_decrypt; let decrypted = affine_decrypt(4545, "VL}p MM{I}p~{HL}Gp{vp pFsH}pxMpyxIx JHL O}F{~pvuO

(key: usize, message: &str)