[rust] Don't borrow inputs for day solvers

rust/src/day.rs

@@ -1,6 +1,6 @@
 use std::io;
 
 pub trait Day {
-    fn new(&String) -> Self;
+    fn new(String) -> Self;
     fn solve(&self) -> io::Result<i32>;
 }

rust/src/day_01.rs

@@ -8,8 +8,8 @@ pub struct Day01 {
 }
 
 impl Day for Day01 {
-    fn new(input: &String) -> Day01 {
-        Day01 { input: input.clone() }
+    fn new(input: String) -> Day01 {
+        Day01 { input: input }
     }
 
     fn solve(&self) -> io::Result<i32> {

rust/src/day_02.rs

@@ -7,7 +7,7 @@ pub struct Day02 {
 }
 
 impl Day for Day02 {
-    fn new(input: &String) -> Day02 {
+    fn new(input: String) -> Day02 {
         let presents = input.split("\n").map(|line| Present::new(line));
         Day02 { presents: presents.collect::<Vec<Present>>() }
     }

rust/src/day_03.rs

@@ -12,8 +12,8 @@ pub struct Day03 {
 }
 
 impl Day for Day03 {
-    fn new(input: &String) -> Day03 {
-        Day03 { directions: input.clone() }
+    fn new(input: String) -> Day03 {
+        Day03 { directions: input }
     }
 
     fn solve(&self) -> io::Result<i32> {

rust/src/main.rs

@@ -20,6 +20,6 @@ fn read_input(filename: &str) -> Result<String, io::Error> {
 
 fn main() {
     let input = read_input("day_03").unwrap();
-    let day = Day03::new(&input);
+    let day = Day03::new(input);
     println!("{}", day.solve().unwrap());
 }