Blindly follow all clippy's decrees

src/day08.rs

@@ -52,7 +52,7 @@ pub fn process_part_2(input: &str) -> usize {
 fn parse_trees(input: &str) -> Vec<Vec<u8>> {
     input
         .trim()
-        .split("\n")
+        .split('\n')
         .map(|i| i.chars().map(|c| c.to_digit(10).unwrap() as u8).collect())
         .collect()
 }