fix: exercise order - string before struct

The struct exercises rely on knowledge learned in the string exercises, so should follow rather than precede them.

info.toml

@@ -218,6 +218,29 @@ Data Types -> The Tuple Type section of the book:
 https://doc.rust-lang.org/book/ch03-02-data-types.html#the-tuple-type
 Now you have another tool in your toolbox!"""
 
+# STRINGS
+
+[[exercises]]
+name = "strings1"
+path = "exercises/strings/strings1.rs"
+mode = "compile"
+hint = """
+The `current_favorite_color` function is currently returning a string slice with the `'static`
+lifetime. We know this because the data of the string lives in our code itself -- it doesn't
+come from a file or user input or another program -- so it will live as long as our program
+lives. But it is still a string slice. There's one way to create a `String` by converting a
+string slice covered in the Strings chapter of the book, and another way that uses the `From`
+trait."""
+
+[[exercises]]
+name = "strings2"
+path = "exercises/strings/strings2.rs"
+mode = "compile"
+hint = """
+Yes, it would be really easy to fix this by just changing the value bound to `word` to be a
+string slice instead of a `String`, wouldn't it?? There is a way to add one character to line
+9, though, that will coerce the `String` into a string slice."""
+
 # STRUCTS
 
 [[exercises]]
@@ -254,29 +277,6 @@ For calculate_transport_fees: Bigger is more expensive usually, we don't have si
 
 Have a look in The Book, to find out more about method implementations: https://doc.rust-lang.org/book/ch05-03-method-syntax.html"""
 
-# STRINGS
-
-[[exercises]]
-name = "strings1"
-path = "exercises/strings/strings1.rs"
-mode = "compile"
-hint = """
-The `current_favorite_color` function is currently returning a string slice with the `'static`
-lifetime. We know this because the data of the string lives in our code itself -- it doesn't
-come from a file or user input or another program -- so it will live as long as our program
-lives. But it is still a string slice. There's one way to create a `String` by converting a
-string slice covered in the Strings chapter of the book, and another way that uses the `From`
-trait."""
-
-[[exercises]]
-name = "strings2"
-path = "exercises/strings/strings2.rs"
-mode = "compile"
-hint = """
-Yes, it would be really easy to fix this by just changing the value bound to `word` to be a
-string slice instead of a `String`, wouldn't it?? There is a way to add one character to line
-9, though, that will coerce the `String` into a string slice."""
-
 # TEST 2
 
 [[exercises]]