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/rule/mod.rs

@@ -95,7 +95,7 @@ impl Rule {
 
 impl From<String> for Rule {
     fn from(source: String) -> Self {
-        let components: Vec<&str> = source.split_terminator(">").collect();
+        let components: Vec<&str> = source.split_terminator('>').collect();
         Self {
             from: Regex::new(components[0]),
             to: String::from(components[1]),

src/settings/rule/regex_wrapper.rs

@@ -11,10 +11,6 @@ impl Regex {
     pub fn as_str(&self) -> &str {
         self.0.as_str()
     }
-
-    pub fn to_string(&self) -> String {
-        self.0.to_string()
-    }
 }
 
 use std::hash::{Hash, Hasher};