Fix cargo fmt errors that were breaking the build.

exercise-solutions/iterators/src/bin/iterators1.rs

@@ -1,12 +1,11 @@
-#![allow(unused_imports)]
-use std::io::{BufRead, BufReader};
-use std::fs::File;
 use std::error::Error;
+use std::fs::File;
+use std::io::{BufRead, BufReader};
 
 fn main() -> Result<(), Box<dyn Error>> {
-    // Idiomatic solution
     let second_reader = BufReader::new(File::open("../exercise-solutions/iterators/numbers.txt")?);
-    let nicer_sum: i32 = second_reader.lines()
+    let nicer_sum: i32 = second_reader
+        .lines()
         .filter_map(|line| line.ok())
         .filter_map(|s| s.parse().ok())
         .filter(|num| num % 2 != 0)

exercise-templates/iterators/src/bin/iterators1.rs

@@ -1,17 +1,16 @@
 #![allow(unused_imports)]
-use std::io::BufReader;
-use std::fs::File;
 use std::error::Error;
+use std::fs::File;
+use std::io::BufReader;
 
 fn main() -> Result<(), Box<dyn Error>> {
     use crate::*;
     let f = File::open("../exercise-templates/iterators/numbers.txt")?;
     let reader = BufReader::new(f);
 
-    // Write your iterator chain here 
+    // Write your iterator chain here
     let sum_of_odd_numbers: i32 = todo!("use reader.lines() and Iterator methods");
 
     assert_eq!(sum_of_odd_numbers, 31);
     Ok(())
 }
-