Auto merge of #171 - miller-time:rustfmt-exercises, r=komaeda

chore: Clean up some formatting in exercises

I noticed some formatting that isn't consistent with the `rustfmt` style and tried my best to run it on the files in the exercises directory (which does fail for files that can't compile!), which just caught some minor whitespace things here and there.

Note: also can't just apply `rustfmt` blindly because of the blank lines that lead to the hint comments

exercises/if/if1.rs

@@ -1,6 +1,6 @@
 // if1.rs
 
-pub fn bigger(a: i32, b:i32) -> i32 {
+pub fn bigger(a: i32, b: i32) -> i32 {
     // Complete this function to return the bigger number!
     // Do not use:
     // - return

exercises/modules/modules2.rs

@@ -17,9 +17,11 @@ mod delicious_snacks {
 }
 
 fn main() {
-    println!("favorite snacks: {} and {}",
-             delicious_snacks::fruit,
-             delicious_snacks::veggie);
+    println!(
+        "favorite snacks: {} and {}",
+        delicious_snacks::fruit,
+        delicious_snacks::veggie
+    );
 }
 
 

exercises/move_semantics/move_semantics1.rs

@@ -11,7 +11,6 @@ fn main() {
     vec1.push(88);
 
     println!("{} has length {} content `{:?}`", "vec1", vec1.len(), vec1);
-
 }
 
 fn fill_vec(vec: Vec<i32>) -> Vec<i32> {

exercises/move_semantics/move_semantics2.rs

@@ -12,7 +12,6 @@ fn main() {
     vec1.push(88);
 
     println!("{} has length {} content `{:?}`", "vec1", vec1.len(), vec1);
-
 }
 
 fn fill_vec(vec: Vec<i32>) -> Vec<i32> {

exercises/move_semantics/move_semantics3.rs

@@ -13,7 +13,6 @@ fn main() {
     vec1.push(88);
 
     println!("{} has length {} content `{:?}`", "vec1", vec1.len(), vec1);
-
 }
 
 fn fill_vec(vec: Vec<i32>) -> Vec<i32> {

exercises/move_semantics/move_semantics4.rs

@@ -13,7 +13,6 @@ fn main() {
     vec1.push(88);
 
     println!("{} has length {} content `{:?}`", "vec1", vec1.len(), vec1);
-
 }
 
 // `fill_vec()` no longer take `vec: Vec<i32>` as argument

exercises/standard_library_types/arc1.rs

@@ -13,8 +13,7 @@ fn main() {
     let mut joinhandles = Vec::new();
 
     for offset in 0..8 {
-        joinhandles.push(
-        thread::spawn(move || {
+        joinhandles.push(thread::spawn(move || {
             let mut i = offset;
             let mut sum = 0;
             while i < child_numbers.len() {

exercises/standard_library_types/iterators3.rs

@@ -23,8 +23,7 @@ pub struct NotDivisibleError {
 // This function should calculate `a` divided by `b` if `a` is
 // evenly divisible by b.
 // Otherwise, it should return a suitable error.
-pub fn divide(a: i32, b: i32) -> Result<i32, DivisionError> {
-}
+pub fn divide(a: i32, b: i32) -> Result<i32, DivisionError> {}
 
 #[cfg(test)]
 mod tests {
@@ -40,7 +39,7 @@ mod tests {
     fn test_not_divisible() {
         assert_eq!(
             divide(81, 6),
-            Err(DivisionError::NotDivisible(NotDivisibleError{
+            Err(DivisionError::NotDivisible(NotDivisibleError {
                 dividend: 81,
                 divisor: 6
             }))

exercises/test3.rs

@@ -7,8 +7,12 @@
 // you think each value is. That is, add either `string_slice` or `string`
 // before the parentheses on each line. If you're right, it will compile!
 
-fn string_slice(arg: &str) { println!("{}", arg); }
-fn string(arg: String) { println!("{}", arg); }
+fn string_slice(arg: &str) {
+    println!("{}", arg);
+}
+fn string(arg: String) {
+    println!("{}", arg);
+}
 
 fn main() {
     ("blue");