day9: part1 and bruteforce part 2 (some cleanups and clippies)

src/day8.rs

@@ -9,13 +9,13 @@ struct Junction {
 }
 
 fn squared_distance(a: &Junction, b: &Junction) -> u64 {
-    if a.pos == b.pos {
-        0
-    } else {
-        (a.pos.0 - b.pos.0).pow(2) as u64
-            + (a.pos.1 - b.pos.1).pow(2) as u64
-            + (a.pos.2 - b.pos.2).pow(2) as u64
-    }
+    // if a.pos == b.pos {
+    //     0
+    // } else {
+    (a.pos.0 - b.pos.0).pow(2) as u64
+        + (a.pos.1 - b.pos.1).pow(2) as u64
+        + (a.pos.2 - b.pos.2).pow(2) as u64
+    // }
 }
 
 impl Junction {
@@ -144,6 +144,7 @@ struct JunctionPair {
     a: usize,
     b: usize,
 }
+
 fn make_heap(circuits: &Circuits) -> BinaryHeap<Reverse<JunctionPair>> {
     BinaryHeap::from_iter(
         circuits