diff --git a/src/main.rs b/src/main.rs
index 6352395..dc8d6a6 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -2,7 +2,6 @@ use std::{
     error::Error,
     fmt::{self, Display},
     io::{self, prelude::*},
-    str::FromStr,
 };
 
 use bitvec::vec::BitVec;
@@ -16,6 +15,41 @@ struct BoardConsts {
     goals: BitVec,
 }
 
+#[allow(
+    clippy::cast_possible_truncation,
+    clippy::cast_possible_wrap,
+    clippy::cast_sign_loss
+)]
+impl BoardConsts {
+    pub fn height(&self) -> i16 {
+        self.walls.len() as i16 / self.width
+    }
+
+    fn index_of(&self, (x, y): Pos) -> usize {
+        (x + y * self.width) as usize
+    }
+
+    pub fn in_bounds(&self, (x, y): Pos) -> bool {
+        (0..self.width).contains(&x) && (0..self.height()).contains(&y)
+    }
+
+    pub fn wall_at(&self, pos: Pos) -> bool {
+        if !self.in_bounds(pos) {
+            return true;
+        }
+
+        *self.walls.get(self.index_of(pos)).unwrap()
+    }
+
+    pub fn goal_at(&self, pos: Pos) -> bool {
+        if !self.in_bounds(pos) {
+            return false;
+        }
+
+        *self.goals.get(self.index_of(pos)).unwrap()
+    }
+}
+
 #[derive(Debug)]
 struct Board {
     pub player: Pos,
@@ -47,40 +81,12 @@ impl Error for BoardParseError {}
     clippy::cast_sign_loss
 )]
 impl Board {
-    pub fn height(&self, consts: &BoardConsts) -> i16 {
-        self.boxes.len() as i16 / consts.width
-    }
-
-    pub fn in_bounds(&self, consts: &BoardConsts, (x, y): Pos) -> bool {
-        (0..consts.width).contains(&x) && (0..self.height(consts)).contains(&y)
-    }
-
-    fn index_of(&self, consts: &BoardConsts, (x, y): Pos) -> usize {
-        (x + y * consts.width) as usize
-    }
-
-    pub fn wall_at(&self, consts: &BoardConsts, pos: Pos) -> bool {
-        if !self.in_bounds(consts, pos) {
-            return true;
-        }
-
-        *consts.walls.get(self.index_of(consts, pos)).unwrap()
-    }
-
-    pub fn goal_at(&self, consts: &BoardConsts, pos: Pos) -> bool {
-        if !self.in_bounds(consts, pos) {
-            return false;
-        }
-
-        *consts.goals.get(self.index_of(consts, pos)).unwrap()
-    }
-
     pub fn box_at(&self, consts: &BoardConsts, pos: Pos) -> bool {
-        if !self.in_bounds(consts, pos) {
+        if !consts.in_bounds(pos) {
             return false;
         }
 
-        *self.boxes.get(self.index_of(consts, pos)).unwrap()
+        *self.boxes.get(consts.index_of(pos)).unwrap()
     }
 
     pub fn parse(src: &str) -> Result<(BoardConsts, Board), BoardParseError> {
@@ -129,10 +135,10 @@ impl Board {
     }
 
     fn write(&self, consts: &BoardConsts, f: &mut impl Write) -> Result<(), Box<dyn Error>> {
-        for y in 0..self.height(consts) {
+        for y in 0..consts.height() {
             for x in 0..consts.width {
                 if self.player == (x, y) {
-                    if self.goal_at(consts, (x, y)) {
+                    if consts.goal_at((x, y)) {
                         write!(f, "+")?;
                     } else {
                         write!(f, "@")?;
@@ -143,8 +149,8 @@ impl Board {
                     f,
                     "{}",
                     match (
-                        self.wall_at(consts, (x, y)),
-                        self.goal_at(consts, (x, y)),
+                        consts.wall_at((x, y)),
+                        consts.goal_at((x, y)),
                         self.box_at(consts, (x, y))
                     ) {
                         (true, false, false) => '#',