added(): save

exercises/move_semantics/move_semantics2.rs

@@ -2,14 +2,14 @@
 // Make me compile without changing line 13 or moving line 10!
 // Execute `rustlings hint move_semantics2` for hints :)
 
-// I AM NOT DONE
+// TOTHINK
 
-fn main() {
-    let vec0 = Vec::new();
+pub fn main() {
+    let vec0 : Vec<i32> = Vec::new();
+    let vec_ = Vec::new();
 
-    let mut vec1 = fill_vec(vec0);
+    let mut vec1 = fill_vec(vec_);
 
-    let vec0 = vec1.clone();
     // Do not change the following line!
     println!("{} has length {} content `{:?}`", "vec0", vec0.len(), vec0);
 

exercises/move_semantics/move_semantics3.rs

@@ -17,7 +17,7 @@ fn main() {
     println!("{} has length {} content `{:?}`", "vec1", vec1.len(), vec1);
 }
 
-fn fill_vec(vec: Vec<i32>) -> Vec<i32> {
+fn fill_vec(mut vec: Vec<i32>) -> Vec<i32> {
     vec.push(22);
     vec.push(44);
     vec.push(66);

exercises/move_semantics/move_semantics4.rs

@@ -4,13 +4,13 @@
 // freshly created vector from fill_vec to its caller.
 // Execute `rustlings hint move_semantics4` for hints!
 
-// I AM NOT DONE
+
 
 fn main() {
-    let vec0 = Vec::new();
-
-    let mut vec1 = fill_vec(vec0);
+    // let vec0 = Vec::new();
 
+    // let mut vec1 = fill_vec(vec0);
+    let mut vec1 = fill_vec();
     println!("{} has length {} content `{:?}`", "vec1", vec1.len(), vec1);
 
     vec1.push(88);
@@ -20,7 +20,8 @@ fn main() {
 
 // `fill_vec()` no longer takes `vec: Vec<i32>` as argument
 fn fill_vec() -> Vec<i32> {
-    let mut vec = vec;
+    // let mut vec = vec;
+    let mut vec = Vec::new();
 
     vec.push(22);
     vec.push(44);

exercises/move_semantics/move_semantics5.rs

@@ -3,13 +3,17 @@
 // adding, changing or removing any of them.
 // Execute `rustlings hint move_semantics5` for hints :)
 
-// I AM NOT DONE
+// TOTHINK
 
 fn main() {
     let mut x = 100;
-    let y = &mut x;
+
     let z = &mut x;
-    *y += 100;
     *z += 1000;
+    
+    let y = &mut x; //cannot borrow `x` as mutable more than once at a time
+    *y += 100;
+
+
     assert_eq!(x, 1200);
 }

exercises/traits/traits1.rs

@@ -15,7 +15,10 @@ trait AppendBar {
 }
 
 impl AppendBar for String {
-    //Add your code here
+    fn append_bar(self) -> Vec<String> {
+        self.push("Bar".to_string());
+        self
+    }
 }
 
 fn main() {