feat: Refactor hint system

Hints are now accessible using the CLI subcommand `rustlings hint
<exercise name`.

BREAKING CHANGE: This fundamentally changes the way people interact with exercises.

2 files changed, 4 insertions, 66 deletions

diff --git a/exercises/strings/strings1.rs b/exercises/strings/strings1.rs
index 2e5088f..0faf86e 100644
--- a/exercises/strings/strings1.rs
+++ b/exercises/strings/strings1.rs
@@ -1,5 +1,6 @@
 // strings1.rs
-// Make me compile without changing the function signature! Scroll down for hints :)
+// Make me compile without changing the function signature!
+// Execute `rustlings hint strings1` for hints ;)
 
 fn main() {
     let answer = current_favorite_color();
@@ -9,38 +10,3 @@ fn main() {
 fn current_favorite_color() -> String {
     "blue"
 }
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-// 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.
diff --git a/exercises/strings/strings2.rs b/exercises/strings/strings2.rs
index c77e16f..bd0f35c 100644
--- a/exercises/strings/strings2.rs
+++ b/exercises/strings/strings2.rs
@@ -1,5 +1,6 @@
 // strings2.rs
-// Make me compile without changing the function signature! Scroll down for hints :)
+// Make me compile without changing the function signature!
+// Execute `rustlings hint strings2` for hints :)
 
 fn main() {
     let word = String::from("green"); // Try not changing this line :)
@@ -13,32 +14,3 @@ fn main() {
 fn is_a_color_word(attempt: &str) -> bool {
     attempt == "green" || attempt == "blue" || attempt == "red"
 }
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-// 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
-// 6, though, that will coerce the `String` into a string slice.