diff --git a/src/digest.rs b/src/digest.rs
index 3f1b4ae..4e1e0b4 100644
--- a/src/digest.rs
+++ b/src/digest.rs
@@ -32,7 +32,7 @@ impl QuoteForDigest for String {
 }
 
 /// Join a Vec of Display items using a separator
-fn join_vec<T: ToString>(vec: &Vec<T>, sep: &str) -> String {
+fn join_vec<T: ToString>(vec: &[T], sep: &str) -> String {
     vec.iter()
         .map(ToString::to_string)
         .collect::<Vec<_>>()
@@ -507,8 +507,8 @@ impl AuthorizationHeader {
                 None => {
                     let mut rng = rand::thread_rng();
                     let nonce_bytes: [u8; 16] = rng.gen();
-                    let cnonce = hex::encode(nonce_bytes);
-                    cnonce
+
+                    hex::encode(nonce_bytes)
                 }
             }
         };
@@ -654,7 +654,7 @@ impl AuthorizationHeader {
         };
 
         if auth.qop.is_some() {
-            if !auth.cnonce.is_some() {
+            if auth.cnonce.is_none() {
                 return Err(MissingRequired("cnonce", input.into()));
             }
         } else {
diff --git a/src/enums.rs b/src/enums.rs
index 87eeb57..c6a60a9 100644
--- a/src/enums.rs
+++ b/src/enums.rs
@@ -30,8 +30,8 @@ impl Algorithm {
     }
 
     /// Calculate a hash of bytes using the selected algorithm
-    pub fn hash(&self, bytes: &[u8]) -> String {
-        let mut hash : Box<dyn DynDigest> = match self.algo {
+    pub fn hash(self, bytes: &[u8]) -> String {
+        let mut hash: Box<dyn DynDigest> = match self.algo {
             AlgorithmType::MD5 => Box::new(Md5::new()),
             AlgorithmType::SHA2_256 => Box::new(Sha256::new()),
             AlgorithmType::SHA2_512_256 => Box::new(Sha512Trunc256::new()),
@@ -42,7 +42,7 @@ impl Algorithm {
     }
 
     /// Calculate a hash of string's bytes using the selected algorithm
-    pub fn hash_str(&self, bytes: &str) -> String {
+    pub fn hash_str(self, bytes: &str) -> String {
         self.hash(bytes.as_bytes())
     }
 }
diff --git a/src/lib.rs b/src/lib.rs
index 3f1c870..371453b 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -101,5 +101,5 @@ Digest username="Mufasa",
 
 #[test]
 fn test_cast_error() {
-    let _m : Box<dyn std::error::Error> = Error::UnknownAlgorithm("Uhhh".into()).into();
+    let _m: Box<dyn std::error::Error> = Error::UnknownAlgorithm("Uhhh".into()).into();
 }