Fixed code warnings

day03/src/main.rs

@@ -6,7 +6,7 @@ fn get_number_of_trees(right: usize, down: usize, board: &[Vec<char>]) -> usize
     let mut trees = 0;
     while x < board.len() {
         let line = &board[x];
-        if (line[y] == '#') {
+        if line[y] == '#' {
             trees = trees + 1;
         }
 

day17-easy/src/board_metadata.rs

@@ -1,4 +1,3 @@
-use std::default::Default;
 use std::ops::{Index, IndexMut};
 use ndarray::Array3;
 
@@ -19,13 +18,6 @@ impl CellLocation {
             z,
         }
     }
-
-    fn new_option(x_option: Option<usize>, y_option: Option<usize>, z_option: Option<usize>) -> Option<Self> {
-        match (x_option, y_option, z_option) {
-            (Some(x), Some(y), Some(z)) => Some(Self::new(x, y, z)),
-            _ => None,
-        }
-    }
 }
 
 impl<T> Index<CellLocation> for Array3<T> {

day22/src/main.rs

@@ -1,4 +1,4 @@
-use std::collections::{HashSet, HashMap, VecDeque};
+use std::collections::{HashSet, VecDeque};
 use std::error::Error;
 use std::io::{self, BufRead};