feat: Add move_semantics6.rs exercise (#908)

info.toml

@@ -237,6 +237,21 @@ in the book's section References and Borrowing':
 https://doc.rust-lang.org/book/ch04-02-references-and-borrowing.html#mutable-references.
 """
 
+[[exercises]]
+name = "move_semantics6"
+path = "exercises/move_semantics/move_semantics6.rs"
+mode = "compile"
+hint = """
+To find the answer, you can consult the book section "References and Borrowing":
+https://doc.rust-lang.org/stable/book/ch04-02-references-and-borrowing.html
+The first problem is that `get_char` is taking ownership of the string.
+So `data` is moved and can't be used for `string_uppercase`
+`data` is moved to `get_char` first, meaning that `string_uppercase` cannot manipulate the data.
+Once you've fixed that, `string_uppercase`'s function signature will also need to be adjusted.
+Can you figure out how?
+
+Another hint: it has to do with the `&` character."""
+
 # PRIMITIVE TYPES
 
 [[exercises]]