Fix clippy warnings

src/main.rs

@@ -14,9 +14,9 @@ fn main() {
     // Prepare i18n
     setlocale(LocaleCategory::LcAll, "");
     bindtextdomain(GETTEXT_PACKAGE, LOCALEDIR)
-        .unwrap_or_else(|_| panic!("Unable to bind text domain for {}", GETTEXT_PACKAGE));
+        .unwrap_or_else(|_| panic!("Unable to bind text domain for {GETTEXT_PACKAGE}"));
     textdomain(GETTEXT_PACKAGE)
-        .unwrap_or_else(|_| panic!("Unable to switch to text domain {}", GETTEXT_PACKAGE));
+        .unwrap_or_else(|_| panic!("Unable to switch to text domain {GETTEXT_PACKAGE}"));
 
     glib::set_application_name(&gettext("Tour"));
     glib::set_prgname(Some("Tour"));

src/utils.rs

@@ -5,7 +5,7 @@ use regex::{Captures, Regex};
 pub fn i18n_f(format: &str, kwargs: &[(&str, &str)]) -> String {
     let mut s = gettext(format);
     for (k, v) in kwargs {
-        if let Ok(re) = Regex::new(&format!("\\{{{}\\}}", k)) {
+        if let Ok(re) = Regex::new(&format!("\\{{{k}\\}}")) {
             s = re
                 .replace_all(&s, |_: &Captures<'_>| v.to_string())
                 .to_string();