Less lines :p

src/prob4/mod.rs

@@ -4,7 +4,7 @@ fn mutual_inclusion(first_pair: &[u32], second_pair: &[u32]) -> bool {
 }
 
 pub fn solve_part1(file_path: &str) -> i32 {
-    let result = std::fs::read_to_string(file_path)
+    std::fs::read_to_string(file_path)
         .expect("Please provide a text file as an argument.")
         .lines()
         .map(|line| {
@@ -35,6 +35,7 @@ pub fn solve_part1(file_path: &str) -> i32 {
                 0
             }
         })
-        .collect::<Vec<i32>>();
-    result.iter().sum()
+        .collect::<Vec<i32>>()
+        .iter()
+        .sum()
 }