Update Exercises Directory Names to Reflect Order

exercises/06_move_semantics/README.md

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+# Move Semantics
+
+These exercises are adapted from [pnkfelix](https://github.com/pnkfelix)'s [Rust Tutorial](https://pnkfelix.github.io/rust-examples-icfp2014/) -- Thank you Felix!!!
+
+## Further information
+
+For this section, the book links are especially important.
+
+- [Ownership](https://doc.rust-lang.org/book/ch04-01-what-is-ownership.html)
+- [Reference and borrowing](https://doc.rust-lang.org/book/ch04-02-references-and-borrowing.html)

exercises/06_move_semantics/move_semantics1.rs

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+// move_semantics1.rs
+//
+// Execute `rustlings hint move_semantics1` or use the `hint` watch subcommand
+// for a hint.
+
+// I AM NOT DONE
+
+#[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;
+
+    vec.push(88);
+
+    vec
+}

exercises/06_move_semantics/move_semantics2.rs

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+// 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.
+
+// I AM NOT DONE
+
+#[test]
+fn main() {
+    let vec0 = vec![22, 44, 66];
+
+    let mut 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;
+
+    vec.push(88);
+
+    vec
+}

exercises/06_move_semantics/move_semantics3.rs

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+// 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.
+
+// I AM NOT DONE
+
+#[test]
+fn main() {
+    let vec0 = vec![22, 44, 66];
+
+    let mut vec1 = fill_vec(vec0);
+
+    assert_eq!(vec1, vec![22, 44, 66, 88]);
+}
+
+fn fill_vec(vec: Vec<i32>) -> Vec<i32> {
+    vec.push(88);
+
+    vec
+}

exercises/06_move_semantics/move_semantics4.rs

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+// 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.
+
+// I AM NOT DONE
+
+#[test]
+fn main() {
+    let vec0 = vec![22, 44, 66];
+
+    let mut vec1 = fill_vec(vec0);
+
+    assert_eq!(vec1, vec![22, 44, 66, 88]);
+}
+
+// `fill_vec()` no longer takes `vec: Vec<i32>` as argument - don't change this!
+fn fill_vec() -> Vec<i32> {
+    // Instead, let's create and fill the Vec in here - how do you do that?
+    let mut vec = vec;
+
+    vec.push(88);
+
+    vec
+}

exercises/06_move_semantics/move_semantics5.rs

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+// move_semantics5.rs
+//
+// Make me compile only by reordering the lines in `main()`, but without adding,
+// changing or removing any of them.
+//
+// Execute `rustlings hint move_semantics5` or use the `hint` watch subcommand
+// for a hint.
+
+// I AM NOT DONE
+
+#[test]
+fn main() {
+    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

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+// 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.
+
+// I AM NOT DONE
+
+fn main() {
+    let data = "Rust is great!".to_string();
+
+    get_char(data);
+
+    string_uppercase(&data);
+}
+
+// Should not take ownership
+fn get_char(data: String) -> char {
+    data.chars().last().unwrap()
+}
+
+// Should take ownership
+fn string_uppercase(mut data: &String) {
+    data = &data.to_uppercase();
+
+    println!("{}", data);
+}