cryptoys 1.2.1

a cryptographic library filled with cryptographic toys(mostly historical ciphers)
Documentation 
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//! rot13
use crate::historical::caesar;
use crate::Solve;

pub struct Rot13Ciphertext {
    ciphertext: String,
}

/// Solves a Rot13Ciphertext
impl Solve for Rot13Ciphertext {
    fn solve(&self) -> String {
        caesar::encrypt(self.ciphertext.as_str(), 13).to_string()
    }
}

/// Returns a string from a Rot13Ciphertext
impl ToString for Rot13Ciphertext {
    fn to_string(&self) -> String {
        self.ciphertext.to_string()
    }
}

/// encrypts plaintext using rot13
///
/// # Example
/// ```
/// use cryptoys::historical::rot13;
///
/// let rot13_encrypted_text = rot13::encrypt("Hello World!");
///
/// assert_eq!("Uryyb Jbeyq!".to_string(), rot13_encrypted_text.to_string());
/// ```
pub fn encrypt(plaintext: &str) -> Rot13Ciphertext {
    let mut result = String::new();

    for c in plaintext.chars() {
        let new_char = match c {
            'A'..='Z' => (((c as u32 - 'A' as u32 + 13_u32) % 26) + 'A' as u32) as u8 as char,
            'a'..='z' => (((c as u32 - 'a' as u32 + 13_u32) % 26) + 'a' as u32) as u8 as char,
            _ => c,
        };
        result.push(new_char);
    }

    Rot13Ciphertext { ciphertext: result }
}

/// decrypts rot13 ciphertext
///
/// # Example
/// ```
/// use cryptoys::historical::rot13;
///
/// let decrypt_rot13_text = rot13::decrypt("Uryyb Jbeyq!");
///
/// assert_eq!("Hello World!".to_string(), decrypt_rot13_text);
/// ```
pub fn decrypt(ciphertext: &str) -> String {
    caesar::encrypt(ciphertext, 13).to_string()
}