Remove unnecessary code

This commit removes some unnecessary code, such as an extra `String`
clone, unnecessary `return` statements, and an inherent `to_string`
function for the `Regex` wrapper.

A double-quote character considered as a string literal by the
compiler was also changed to a single-quote character, this time
considered as a character by the compiler, for some optimization.

Also a newline is added in order to improve code readablitiy.

src/settings/mod.rs

@@ -87,6 +87,7 @@ macro_rules! decode_settings {
 }
 
 use std::collections::HashMap;
+
 /// Representation of the software’s settings
 ///
 /// This struct represents all the settings the software has to follow
@@ -334,7 +335,7 @@ impl Settings {
     pub fn apply(&self, s: String) -> std::result::Result<String, String> {
         // TODO Add Error handling
         let rules = self.update_rules().unwrap();
-        let mut s = s.clone();
+        let mut s = s;
         debug!("===============================================");
         for rule in rules {
             debug!(
@@ -379,7 +380,7 @@ impl FromStr for Settings {
                 Ok(val) => Ok(val),
                 Err(e) => {
                     error!("Could not decode input {}: {}", s, e.to_string());
-                    return Err(e);
+                    Err(e)
                 }
             },
         }