day(06): refactor

Signed-off-by: Matej Focko <mfocko@redhat.com>

src/bin/day06.rs

@@ -1,9 +1,8 @@
 use std::collections::HashSet;
-use std::str::FromStr;
 
 use aoc_2022::*;
 
-use color_eyre::eyre::{Report, Result};
+use color_eyre::eyre::Result;
 use itertools::Itertools;
 use tracing::*;
 use tracing_subscriber::EnvFilter;
@@ -11,30 +10,25 @@ use tracing_subscriber::EnvFilter;
 type Input = String;
 type Output = usize;
 
-fn part_1(input: &str) -> Output {
+fn unique_marker_index(buffer: &Input, n: usize) -> Output {
-    let chars: Vec<_> = input.chars().collect();
+    let chars: Vec<_> = buffer.chars().collect();
 
     chars
-        .windows(4)
+        .windows(n)
         .enumerate()
         .map(|(i, chars)| (i, chars.iter().collect::<HashSet<_>>()))
-        .find_or_first(|(_, s)| s.len() == 4)
+        .find_or_first(|(_, s)| s.len() == n)
         .unwrap()
         .0
-        + 4
+        + n
+}
+
+fn part_1(input: &Input) -> Output {
+    unique_marker_index(input, 4)
 }
 
 fn part_2(input: &Input) -> Output {
-    let chars: Vec<_> = input.chars().collect();
+    unique_marker_index(input, 14)
-
-    chars
-        .windows(14)
-        .enumerate()
-        .map(|(i, chars)| (i, chars.iter().collect::<HashSet<_>>()))
-        .find_or_first(|(_, s)| s.len() == 14)
-        .unwrap()
-        .0
-        + 14
 }
 
 fn parse_input(pathname: &str) -> Input {