Rust: completed Reverse String again

rust/reverse-string/.exercism/metadata.json

@@ -1 +1 @@
-{"track":"rust","exercise":"reverse-string","id":"aeec5dd024f94c60b89e66907f4e90b9","url":"https://exercism.org/tracks/rust/exercises/reverse-string","handle":"Chomp1295","is_requester":true,"auto_approve":false}
+{"track":"rust","exercise":"reverse-string","id":"f97879b6def647a5bf82751034c483e3","url":"https://exercism.org/tracks/rust/exercises/reverse-string","handle":"Chomp1295","is_requester":true,"auto_approve":false}

rust/reverse-string/Cargo.toml

@@ -1,9 +1,10 @@
-[dependencies]
-
-[features]
-grapheme = []
-
 [package]
 edition = "2021"
 name = "reverse_string"
 version = "1.2.0"
+
+[features]
+grapheme = []
+
+[dependencies]
+unicode-segmentation = "=1.11.0"

rust/reverse-string/README.md

@@ -21,17 +21,20 @@ Some examples:
 
 ## Bonus
 
-Test your function on this string: `uüu` and see what happens. Try to write a function that properly
-reverses this string. Hint: grapheme clusters
+Test your function on this string: `uüu` and see what happens.
+Try to write a function that properly reverses this string.
+Hint: grapheme clusters
 
-To get the bonus test to run, remove the ignore flag (`#[ignore]`) from the
-last test, and execute the tests with:
+To get the bonus test to run, remove the ignore flag (`#[ignore]`) from the last test, and execute the tests with:
 
 ```bash
-$ cargo test --features grapheme
+cargo test --features grapheme
 ```
 
-You will need to use external libraries (a `crate` in rust lingo) for the bonus task. A good place to look for those is [crates.io](https://crates.io/), the official repository of crates.
+You will need to use external libraries (a `crate` in rust lingo) for the bonus task.
+A good place to look for those is [crates.io](https://crates.io/), the official repository of crates.
+Please remember that only a limited set of crates is supported by our test runner.
+The full list is in [this file](https://github.com/exercism/rust-test-runner/blob/main/local-registry/Cargo.toml) under the section `[dependencies]`.
 
 [Check the documentation](https://doc.rust-lang.org/cargo/guide/dependencies.html) for instructions on how to use external crates in your projects.
 

rust/reverse-string/src/lib.rs

@@ -1,3 +1,5 @@
+use unicode_segmentation::UnicodeSegmentation;
+
 pub fn reverse(input: &str) -> String {
-    input.chars().rev().collect()
+    input.graphemes(true).rev().collect()
 }

rust/reverse-string/tests/reverse-string.rs

@@ -9,6 +9,7 @@ fn an_empty_string() {
 }
 
 #[test]
+
 fn a_word() {
     let input = "robot";
     let output = reverse(input);
@@ -17,6 +18,7 @@ fn a_word() {
 }
 
 #[test]
+
 fn a_capitalized_word() {
     let input = "Ramen";
     let output = reverse(input);
@@ -25,6 +27,7 @@ fn a_capitalized_word() {
 }
 
 #[test]
+
 fn a_sentence_with_punctuation() {
     let input = "I'm hungry!";
     let output = reverse(input);
@@ -33,6 +36,7 @@ fn a_sentence_with_punctuation() {
 }
 
 #[test]
+
 fn a_palindrome() {
     let input = "racecar";
     let output = reverse(input);
@@ -41,6 +45,7 @@ fn a_palindrome() {
 }
 
 #[test]
+
 fn an_even_sized_word() {
     let input = "drawer";
     let output = reverse(input);
@@ -49,6 +54,7 @@ fn an_even_sized_word() {
 }
 
 #[test]
+
 fn wide_characters() {
     let input = "子猫";
     let output = reverse(input);
@@ -57,7 +63,6 @@ fn wide_characters() {
 }
 
 #[test]
-#[ignore]
 #[cfg(feature = "grapheme")]
 fn grapheme_cluster_with_pre_combined_form() {
     let input = "Würstchenstand";
@@ -67,7 +72,6 @@ fn grapheme_cluster_with_pre_combined_form() {
 }
 
 #[test]
-#[ignore]
 #[cfg(feature = "grapheme")]
 fn grapheme_clusters() {
     let input = "ผู้เขียนโปรแกรม";