public/subjects/cipher

cipher

Instructions

The Atbash cipher is a encryption method in which each letter of a word is replaced with its mirror letter in the alphabet

Your objective is to create a function called cipher this must return a Result wrapped in an Option, this result should return either a boolean or an Error being the structure CipherError. This structure should be the error type for the function cipher

This function should compare the original string wih the ciphered string. returning true if the cipher is correct otherwise the error type CipherErr with the a true or false if it is validated and the proper atbash cipher.

Expected Function

#[derive(Debug, Clone, Eq, PartialEq)]
pub struct CipherError {
    // expected public fields
}
impl CipherError {
    pub fn new(validation: bool, expected: String) -> CipherError {}
}
pub fn cipher(original: &str, ciphered: &str) -> Option<Result<bool, CipherError>> {}

Usage

Here is a program to test your function

fn main() {
    println!("{:?}", cipher("1Hello 2world!", "1Svool 2dliow!"));
    println!("{:?}", cipher("1Hello 2world!", "svool"));
    println!("{:?}", cipher("", "svool"));
}

And its output:

student@ubuntu:~/[[ROOT]]/test$ cargo run
Some(Ok(true))
Some(Err(CipherError { validation: false, expected: "1Svool 2dliow!" }))
None
student@ubuntu:~/[[ROOT]]/test$