added Clone for HolidayChecker

src/countries/de.rs

@@ -6,7 +6,7 @@ use crate::{
     utils::{self},
 };
 
-#[derive(Debug)]
+#[derive(Debug, Clone)]
 pub(crate) struct GermanHolidays(pub Vec<Holiday<GermanState>>);
 
 /// Enum representing the states in Germany for holiday checking.

src/countries/fr.rs

@@ -6,7 +6,7 @@ use crate::{
     utils,
 };
 
-#[derive(Debug)]
+#[derive(Debug, Clone)]
 pub(crate) struct FrenchHolidays(pub Vec<Holiday<FrenchState>>);
 
 /// Enum representing the states in France for holiday checking.

src/countries/us.rs

@@ -6,7 +6,7 @@ use crate::{
     utils,
 };
 
-#[derive(Debug)]
+#[derive(Debug, Clone)]
 pub(crate) struct USHolidays(pub Vec<Holiday<USState>>);
 
 /// Enum representing the states in The United States of America for holiday checking.

src/lib.rs

@@ -10,7 +10,7 @@ pub(crate) mod utils;
 
 pub use countries::{CountryState, de::GermanState, fr::FrenchState, us::USState};
 
-#[derive(Debug)]
+#[derive(Debug, Clone)]
 /// Struct for checking holidays in different countries.
 ///
 /// The `HolidayChecker` struct provides methods to check holidays for Germany, the United States, and France.