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README.md | 4 years ago |
README.md
cipher
Instructions
The Atbash cipher is an encryption method in which each letter of a word is replaced by its mirror letter in the alphabet.
Your objective is to create a function called cipher
which must return a Result
wrapped in an Option
, this result should return either a boolean
or an Error
based on the structure CipherError
. This structure should be the error type for the function cipher
.
This function should compare the original String
with the ciphered String
. It should return true
if the cipher is correct. If the cipher is incorrect it should return the error type CipherErr
with a boolean
and the expected atbash cipher String
.
Notions
Expected Function and structure
#[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:
use cipher::*;
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$