derive default traits & add in a Display implementation to print the formatted string when called

Author: tmthecoder

src/lib.rs

@@ -17,13 +17,13 @@
 //!     let hotp_str = HOTP::default_from_utf8(secret);
 //!     // Get an otp with the given counter
 //!     let otp_from_str = hotp_str.get_otp(counter);
-//!     println!("The otp from hotp_str: {}", otp_from_str.as_string());
+//!     println!("The otp from hotp_str: {}", otp_from_str);
 //!
 //!     // Alternatively, get a HOTP instance with a '&[u8]' secret
 //!     let hotp_bytes = HOTP::new(secret.as_bytes(), 6);
 //!     // Get an otp with the given counter
 //!     let otp_from_bytes = hotp_bytes.get_otp(counter);
-//!     println!("The otp from hotp_bytes: {}", otp_from_bytes.as_string());
+//!     println!("The otp from hotp_bytes: {}", otp_from_bytes);
 //! }
 //! ```
 //!
@@ -44,7 +44,7 @@
 //!     let totp_sha1_str = TOTP::default_from_utf8(secret);
 //!     // Get an otp with the given counter and elapsed seconds
 //!     let otp_sha1 = totp_sha1_str.get_otp(elapsed_seconds);
-//!     println!("The otp from totp_sha1_str: {}", otp_sha1.as_string());
+//!     println!("The otp from totp_sha1_str: {}", otp_sha1);
 //!
 //!     // Alternatively get a TOTP instance with an '&[u8]' secret
 //!     // and different digest (Sha256 or Sha512)
@@ -59,7 +59,7 @@
 //!         elapsed_seconds,
 //!         0, // Start time at unix epoch
 //!     );
-//!     println!("The otp from totp_sha256_bytes: {}", otp_sha256.as_string());
+//!     println!("The otp from totp_sha256_bytes: {}", otp_sha256);
 //! }
 //! ```
 //!

src/otp_result.rs

@@ -1,5 +1,7 @@
-use std::time::{SystemTime, UNIX_EPOCH};
+use std::fmt;
+use std::fmt::Formatter;
 
+#[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
 pub struct OTPResult {
     digits: u32,
     code: u32,
@@ -23,4 +25,10 @@ impl OTPResult {
     pub fn as_u32(&self) -> u32 {
         self.code
     }
+}
+
+impl fmt::Display for OTPResult {
+    fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
+       write!(f, "{}", self.as_string())
+    }
 }