Fix typos

Author: mo8it

exercises/15_traits/traits2.rs

@@ -3,7 +3,7 @@ trait AppendBar {
 }
 
 // TODO: Implement the trait `AppendBar` for a vector of strings.
-// `appned_bar` should push the string "Bar" into the vector.
+// `append_bar` should push the string "Bar" into the vector.
 
 fn main() {
     // You can optionally experiment here.

exercises/20_threads/threads3.rs

@@ -18,7 +18,7 @@ impl Queue {
 
 fn send_tx(q: Queue, tx: mpsc::Sender<u32>) {
     // TODO: We want to send `tx` to both threads. But currently, it is moved
-    // into the frist thread. How could you solve this problem?
+    // into the first thread. How could you solve this problem?
     thread::spawn(move || {
         for val in q.first_half {
             println!("Sending {val:?}");

src/dev/check.rs

@@ -174,7 +174,7 @@ fn check_exercises(info_file: &InfoFile) -> Result<()> {
 fn check_solutions(require_solutions: bool, info_file: &InfoFile) -> Result<()> {
     let target_dir = parse_target_dir()?;
     let paths = Mutex::new(hashbrown::HashSet::with_capacity(info_file.exercises.len()));
-    let error_occured = AtomicBool::new(false);
+    let error_occurred = AtomicBool::new(false);
 
     println!("Running all solutions. This may take a while...\n");
     thread::scope(|s| {
@@ -188,7 +188,7 @@ fn check_solutions(require_solutions: bool, info_file: &InfoFile) -> Result<()>
                         .unwrap();
                     stderr.write_all(exercise_info.name.as_bytes()).unwrap();
                     stderr.write_all(SEPARATOR).unwrap();
-                    error_occured.store(true, atomic::Ordering::Relaxed);
+                    error_occurred.store(true, atomic::Ordering::Relaxed);
                 };
 
                 let path = exercise_info.sol_path();
@@ -213,7 +213,7 @@ fn check_solutions(require_solutions: bool, info_file: &InfoFile) -> Result<()>
         }
     });
 
-    if error_occured.load(atomic::Ordering::Relaxed) {
+    if error_occurred.load(atomic::Ordering::Relaxed) {
         bail!("At least one solution failed. See the output above.");
     }