Good progress with applying rules, room for improvement

Rules are applied, however some bugs remain:
- The HashMap for rules should be replaced by a Vec so they can be
  stored in order and not randomly
- For some reasons, the `%` is not removed from some rules in the
  private function `update_rules` in the `Settings` struct.
- Make it so replacements between square brackets work correctly

src/lib.rs

@@ -18,7 +18,6 @@ extern crate simplelog;
 use log::{info, warn};
 use simplelog::*;
 
-
 pub mod settings;
 
 /// Initializes the crate
@@ -48,6 +47,11 @@ pub fn init() -> std::result::Result<(), log::SetLoggerError> {
             TerminalMode::Mixed,
         )
         .unwrap(),
+        WriteLogger::new(
+            LevelFilter::Debug,
+            Config::default(),
+            File::create("core.log").unwrap(),
+        ),
         WriteLogger::new(
             LevelFilter::Info,
             Config::default(),