Clean up and unify exercises

exercises/06_move_semantics/move_semantics1.rs

@@ -1,17 +1,3 @@
-// move_semantics1.rs
-//
-// Execute `rustlings hint move_semantics1` or use the `hint` watch subcommand
-// for a hint.
-
-#[test]
-fn main() {
-    let vec0 = vec![22, 44, 66];
-
-    let vec1 = fill_vec(vec0);
-
-    assert_eq!(vec1, vec![22, 44, 66, 88]);
-}
-
 fn fill_vec(vec: Vec<i32>) -> Vec<i32> {
     let vec = vec;
 
@@ -19,3 +5,21 @@ fn fill_vec(vec: Vec<i32>) -> Vec<i32> {
 
     vec
 }
+
+fn main() {
+    // You can optionally experiment here.
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn move_semantics1() {
+        let vec0 = vec![22, 44, 66];
+
+        let vec1 = fill_vec(vec0);
+
+        assert_eq!(vec1, vec![22, 44, 66, 88]);
+    }
+}

exercises/06_move_semantics/move_semantics2.rs

@@ -1,19 +1,4 @@
-// move_semantics2.rs
-//
 // Make the test pass by finding a way to keep both Vecs separate!
-//
-// Execute `rustlings hint move_semantics2` or use the `hint` watch subcommand
-// for a hint.
-
-#[test]
-fn main() {
-    let vec0 = vec![22, 44, 66];
-
-    let vec1 = fill_vec(vec0);
-
-    assert_eq!(vec0, vec![22, 44, 66]);
-    assert_eq!(vec1, vec![22, 44, 66, 88]);
-}
 
 fn fill_vec(vec: Vec<i32>) -> Vec<i32> {
     let mut vec = vec;
@@ -22,3 +7,22 @@ fn fill_vec(vec: Vec<i32>) -> Vec<i32> {
 
     vec
 }
+
+fn main() {
+    // You can optionally experiment here.
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn move_semantics2() {
+        let vec0 = vec![22, 44, 66];
+
+        let vec1 = fill_vec(vec0);
+
+        assert_eq!(vec0, vec![22, 44, 66]);
+        assert_eq!(vec1, vec![22, 44, 66, 88]);
+    }
+}

exercises/06_move_semantics/move_semantics3.rs

@@ -1,22 +1,26 @@
-// move_semantics3.rs
-//
 // Make me compile without adding new lines -- just changing existing lines! (no
 // lines with multiple semicolons necessary!)
-//
-// Execute `rustlings hint move_semantics3` or use the `hint` watch subcommand
-// for a hint.
-
-#[test]
-fn main() {
-    let vec0 = vec![22, 44, 66];
-
-    let vec1 = fill_vec(vec0);
-
-    assert_eq!(vec1, vec![22, 44, 66, 88]);
-}
 
 fn fill_vec(vec: Vec<i32>) -> Vec<i32> {
     vec.push(88);
 
     vec
 }
+
+fn main() {
+    // You can optionally experiment here.
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn move_semantics3() {
+        let vec0 = vec![22, 44, 66];
+
+        let vec1 = fill_vec(vec0);
+
+        assert_eq!(vec1, vec![22, 44, 66, 88]);
+    }
+}

exercises/06_move_semantics/move_semantics4.rs

@@ -1,20 +1,6 @@
-// move_semantics4.rs
-//
 // Refactor this code so that instead of passing `vec0` into the `fill_vec`
 // function, the Vector gets created in the function itself and passed back to
-// the main function.
-//
-// Execute `rustlings hint move_semantics4` or use the `hint` watch subcommand
-// for a hint.
-
-#[test]
-fn main() {
-    let vec0 = vec![22, 44, 66];
-
-    let vec1 = fill_vec(vec0);
-
-    assert_eq!(vec1, vec![22, 44, 66, 88]);
-}
+// the test function.
 
 // `fill_vec()` no longer takes `vec: Vec<i32>` as argument - don't change this!
 fn fill_vec() -> Vec<i32> {
@@ -25,3 +11,21 @@ fn fill_vec() -> Vec<i32> {
 
     vec
 }
+
+fn main() {
+    // You can optionally experiment here.
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn move_semantics4() {
+        let vec0 = vec![22, 44, 66];
+
+        let vec1 = fill_vec(vec0);
+
+        assert_eq!(vec1, vec![22, 44, 66, 88]);
+    }
+}

exercises/06_move_semantics/move_semantics5.rs

@@ -1,17 +1,21 @@
-// move_semantics5.rs
-//
-// Make me compile only by reordering the lines in `main()`, but without adding,
+// Make me compile only by reordering the lines in the test, but without adding,
 // changing or removing any of them.
-//
-// Execute `rustlings hint move_semantics5` or use the `hint` watch subcommand
-// for a hint.
 
-#[test]
 fn main() {
-    let mut x = 100;
-    let y = &mut x;
-    let z = &mut x;
-    *y += 100;
-    *z += 1000;
-    assert_eq!(x, 1200);
+    // You can optionally experiment here.
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn move_semantics5() {
+        let mut x = 100;
+        let y = &mut x;
+        let z = &mut x;
+        *y += 100;
+        *z += 1000;
+        assert_eq!(x, 1200);
+    }
 }

exercises/06_move_semantics/move_semantics6.rs

@@ -1,9 +1,4 @@
-// move_semantics6.rs
-//
 // You can't change anything except adding or removing references.
-//
-// Execute `rustlings hint move_semantics6` or use the `hint` watch subcommand
-// for a hint.
 
 fn main() {
     let data = "Rust is great!".to_string();