fix(day3): you can derive Debug

src/day3/main.rs

@@ -2,6 +2,7 @@ use std::fmt::Debug;
 
 use adventofcode2023::utils::get_puzzle;
 
+#[derive(Debug)]
 struct PartNumber {
     number: u32,
     range: std::ops::Range<usize>,
@@ -9,16 +10,6 @@ struct PartNumber {
     valid: bool,
 }
 
-impl Debug for PartNumber {
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        f.debug_struct("PartNumber")
-            .field("number", &self.number)
-            .field("range", &self.range)
-            .field("line_index", &self.line_index)
-            .finish()
-    }
-}
-
 trait SymbolCheckable {
     fn is_symbol(&self) -> bool;
 }