day9: formatting

9/src/main.rs

@@ -1,6 +1,6 @@
+use itertools::Itertools;
 use std::fs::File;
 use std::io::{BufRead, BufReader, Lines};
-use itertools::Itertools;
 
 // BOILERPLATE
 type InputIter = Lines<BufReader<File>>;
@@ -34,12 +34,8 @@ impl From<&str> for History {
 impl History {
     fn build_row(&mut self) {
         let last = self.0.last().unwrap();
-        self.0.push(
-            last.iter()
-                .tuple_windows()
-                .map(|(a, b)| b - a)
-                .collect(),
-        )
+        self.0
+            .push(last.iter().tuple_windows().map(|(a, b)| b - a).collect())
     }
 
     fn build(&mut self) {
@@ -76,7 +72,10 @@ fn problem1<T: BufRead>(input: Lines<T>) -> i64 {
         history.extrapolate();
     }
 
-    histories.iter().map(|history| history.0.first().unwrap().last().unwrap()).sum()
+    histories
+        .iter()
+        .map(|history| history.0.first().unwrap().last().unwrap())
+        .sum()
 }
 
 // PROBLEM 2 solution
@@ -87,7 +86,10 @@ fn problem2<T: BufRead>(input: Lines<T>) -> i64 {
         history.extrapolate2();
     }
 
-    histories.iter().map(|history| history.0.first().unwrap().first().unwrap()).sum()
+    histories
+        .iter()
+        .map(|history| history.0.first().unwrap().first().unwrap())
+        .sum()
 }
 
 #[cfg(test)]