Day 3 - fmt and change I/O error msg

src/d03.rs

@@ -5,7 +5,7 @@ use std::fs;
 pub fn d03() {
     let path = "res/03/input.txt";
 
-    let contents = fs::read_to_string(path).expect("Should have been able to read the file");
+    let contents = fs::read_to_string(path).expect("I/O error, wrong path?");
 
     let cont_arr = contents.split("\n");
 
@@ -45,15 +45,14 @@ pub fn d03() {
 
     println!("Result 1: {}", result);
 
-
     // 2nd task
     // calculate results - find duplicates in each 3-rucksack groups and sum up
     let mut result = 0;
-    for i in 0..rucksacks.len()/3 {
+    for i in 0..rucksacks.len() / 3 {
         result += first_triplicate_value(
-            &rucksacks[i*3],
-            &rucksacks[i*3 + 1],
-            &rucksacks[i*3 + 2]
+            &rucksacks[i * 3],
+            &rucksacks[i * 3 + 1],
+            &rucksacks[i * 3 + 2],
         );
     }