diff --git a/src/game/mod.rs b/src/game/mod.rs
index 9b34f65..ead7ee9 100644
--- a/src/game/mod.rs
+++ b/src/game/mod.rs
@@ -108,16 +108,16 @@ impl<'wl, WL: WordList> Game<'wl, WL> {
         if self.finished() || self.step > self.max_steps {
             return Err(GameError::TryingToPlayAFinishedGame);
         }
-        if self.wordlist.get_word(&guess).is_none() {
+        if self.wordlist.get_word(guess).is_none() {
             return Err(GameError::WordNotInWordlist(guess.to_string()));
         }
         self.step += 1;
 
         let response;
         if eval.is_some() && self.solution.is_none() {
-            response = GuessResponse::new(&guess, eval.unwrap(), self);
+            response = GuessResponse::new(guess, eval.unwrap(), self);
         } else if let Some(solution) = self.solution.clone() {
-            response = GuessResponse::new(&guess, Self::evaluate(solution, &guess), self);
+            response = GuessResponse::new(guess, Self::evaluate(solution, guess), self);
         } else {
             panic!("there is neither an evaluation nor a predefined solution for this guess");
         }
@@ -126,7 +126,7 @@ impl<'wl, WL: WordList> Game<'wl, WL> {
     }
 
     /// Generates an [Evaluation] for a given solution and guess.
-    pub(crate) fn evaluate(mut solution: WordData, guess: &Word) -> Evaluation {
+    pub(crate) fn evaluate(solution: WordData, guess: &Word) -> Evaluation {
         let mut evaluation = Vec::new();
         let mut status: Status;
         let mut buf = solution.0.clone();
diff --git a/src/solve/naive/mod.rs b/src/solve/naive/mod.rs
index e824dde..f3d94a2 100644
--- a/src/solve/naive/mod.rs
+++ b/src/solve/naive/mod.rs
@@ -3,7 +3,7 @@ use std::collections::HashMap;
 use libpt::log::{debug, error, info, trace};
 
 use crate::error::{SolverError, WResult};
-use crate::game::evaluation::{Evaluation, EvaluationUnit};
+use crate::game::evaluation::{Evaluation};
 use crate::wlist::word::{Word, WordData};
 use crate::wlist::WordList;
 
diff --git a/src/solve/naive/states.rs b/src/solve/naive/states.rs
index 486d7e7..f7ee00d 100644
--- a/src/solve/naive/states.rs
+++ b/src/solve/naive/states.rs
@@ -2,7 +2,6 @@ use std::collections::{HashMap, HashSet};
 use std::fmt::Debug;
 use std::ops::{Range, RangeBounds};
 
-use crate::error::WResult;
 use crate::wlist::word::Word;
 
 pub(crate) type CharMap = HashMap<char, CharInfo>;
diff --git a/src/wlist/mod.rs b/src/wlist/mod.rs
index 57b2f8c..24f7324 100644
--- a/src/wlist/mod.rs
+++ b/src/wlist/mod.rs
@@ -94,7 +94,7 @@ pub trait WordList: Clone + std::fmt::Debug + Default + Sync + Display {
         buf
     }
     fn get_words_matching(&self, pattern: &str) -> WResult<Vec<WordData>> {
-        let pattern = Regex::new(&pattern).map_err(WordlistError::from)?;
+        let pattern = Regex::new(pattern).map_err(WordlistError::from)?;
         let hay = self.raw_wordlist();
         let keys = pattern.captures_iter(&hay);
         let mut buf = Vec::new();
diff --git a/tests/solver.rs b/tests/solver.rs
index 3aa2634..5114211 100644
--- a/tests/solver.rs
+++ b/tests/solver.rs
@@ -85,49 +85,49 @@ fn test_naive_play_predetermined_game_manually() -> anyhow::Result<()> {
     next_guess = sl.guess_for(&game)?;
     assert_eq!(next_guess, Word::from("which"));
     game.guess(
-        next_guess.clone(),
+        &next_guess.clone(),
         Some(Evaluation::build(&next_guess, "xxfxx")?),
     )?;
 
     next_guess = sl.guess_for(&game)?;
     assert_eq!(next_guess, Word::from("their"));
     game.guess(
-        next_guess.clone(),
+        &next_guess.clone(),
         Some(Evaluation::build(&next_guess, "xxffx")?),
     )?;
 
     next_guess = sl.guess_for(&game)?;
     assert_eq!(next_guess, Word::from("being"));
     game.guess(
-        next_guess.clone(),
+        &next_guess.clone(),
         Some(Evaluation::build(&next_guess, "xfffx")?),
     )?;
 
     next_guess = sl.guess_for(&game)?;
     assert_eq!(next_guess, Word::from("since"));
     game.guess(
-        next_guess.clone(),
+        &next_guess.clone(),
         Some(Evaluation::build(&next_guess, "fcfxf")?),
     )?;
 
     next_guess = sl.guess_for(&game)?;
     assert_eq!(next_guess, Word::from("lines"));
     game.guess(
-        next_guess.clone(),
+        &next_guess.clone(),
         Some(Evaluation::build(&next_guess, "xcccc")?),
     )?;
 
     next_guess = sl.guess_for(&game)?;
     assert_eq!(next_guess, Word::from("mines"));
     game.guess(
-        next_guess.clone(),
+        &next_guess.clone(),
         Some(Evaluation::build(&next_guess, "xcccc")?),
     )?;
 
     next_guess = sl.guess_for(&game)?;
     assert_eq!(next_guess, Word::from("wines"));
     game.guess(
-        next_guess.clone(),
+        &next_guess.clone(),
         Some(Evaluation::build(&next_guess, "xcccc")?),
     )?;