Fix clippy errors

day_01/src/main.rs

@@ -20,7 +20,7 @@ fn parse_line(line: &str) -> Result<(i64, i64), Box<dyn Error>> {
     // Parse and return our two elements
     let first_element = split_line[0].parse::<i64>()?;
     let second_element = split_line[1].parse::<i64>()?;
-    return Ok((first_element, second_element));
+    Ok((first_element, second_element))
 }
 
 /// Part 1
@@ -108,5 +108,5 @@ fn main() -> Result<(), Box<dyn Error>> {
         calculate_similarity(left_list, right_list)
     );
 
-    return Ok(());
+    Ok(())
 }