clippy fixes

clippy fixes #2

clippy fixed #3

removed unnecessary stuff

src/tasks/day08.rs

@@ -2,7 +2,7 @@ use crate::utils;
 
 pub fn both() {
     let input: Vec<usize> = utils::read_file("input/day08.txt")
-        .split(" ")
+        .split(' ')
         .map(|x| x.parse().unwrap())
         .collect();
 
@@ -23,13 +23,13 @@ impl Node {
         let num_meta: usize = input[1];
         let mut children = Vec::new();
         while num_children > 0 {
-            let (node, rest) = Node::extract_from(&rest_input);
+            let (node, rest) = Node::extract_from(rest_input);
             children.push(node);
             rest_input = rest;
             num_children -= 1;
         }
 
-        let metadata = rest_input[..num_meta].iter().map(|x| *x).collect();
+        let metadata = rest_input[..num_meta].to_vec();
         (Node { metadata, children }, &rest_input[num_meta..])
     }
 
@@ -39,14 +39,14 @@ impl Node {
                 .children
                 .iter()
                 .map(|child| {
-                    let s: usize = child.metadata_sum().clone();
+                    let s: usize = child.metadata_sum();
                     s
                 })
                 .sum::<usize>()
     }
 
     fn task2(&self) -> usize {
-        if self.children.len() > 0 {
+        if !self.children.is_empty() {
             self.metadata
                 .iter()
                 .map(|meta| match self.children.get(*meta - 1) {