style: lint with clippy

src/db/connection.rs

@@ -5,6 +5,7 @@ pub struct Connection {
 }
 
 impl Connection {
+    #[must_use]
     pub fn new(pool: SqlitePool) -> Self {
         Self {
             sqlite_pool: Arc::new(pool),

src/models/contact.rs

@@ -42,6 +42,9 @@ pub struct Construct {
     pub update: Update,
 }
 impl Construct {
+    /// # Errors
+    ///
+    /// This errors if there is an invalid email or phone number
     pub fn new(
         id: i64,
         first_name: Option<String>,
@@ -90,6 +93,9 @@ impl Construct {
 }
 
 impl Contact {
+    /// # Errors
+    ///
+    /// This errors if there is an invalid email or phone number
     pub fn new(
         first_name: &str,
         last_name: &str,

src/models/metadata.rs

@@ -14,7 +14,7 @@ pub struct Metadata {
 }
 
 impl Metadata {
-    #[allow(dead_code)]
+    #[must_use]
     pub fn new(contact_id: i64) -> Self {
         let now = Utc::now();
 

src/utils/validation.rs

@@ -7,6 +7,7 @@ fn is_valid_phone_number(phone: &str) -> bool {
     phone_regex.is_match(phone)
 }
 
+#[must_use]
 pub fn is_not_valid_phone_number(phone_number: &str) -> bool {
     !is_valid_phone_number(phone_number)
 }
@@ -17,6 +18,7 @@ fn is_valid_email(email: &str) -> bool {
     email_regex.is_match(email)
 }
 
+#[must_use]
 pub fn is_not_valid_email(email: &str) -> bool {
     !is_valid_email(email)
 }