Migrated to rust edition 2021

Cargo.lock

@@ -1,185 +1,187 @@
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+# It is not intended for manual editing.
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Cargo.toml

@@ -2,7 +2,7 @@
 name = "aoc_2018"
 version = "0.1.0"
 authors = ["Johannes <jschaef@mail.uni-paderborn.de>"]
-edition = "2018"
+edition = "2021"
 
 [dependencies]
 regex = "1.1.0"

src/tasks/day22.rs

@@ -154,7 +154,7 @@ impl Cave {
             (position.0 as i32, position.1 as i32 - 1),
             (position.0 as i32, position.1 as i32 + 1),
         ]
-        .into_iter()
+        .iter()
         .filter_map(|(x, y)| {
             if *x >= 0 && *y >= 0 {
                 Some(Node(*x as usize, *y as usize, position.2))