Solve rust/reverse-string

flake.nix

@@ -35,6 +35,7 @@
         {package = pkgs.exercism;}
         {package = pkgs.nil;}
         {package = pkgs.rustc;}
+        {package = pkgs.rustfmt;}
         {package = pkgs.rust-analyzer;}
       ];
     };

rust/reverse-string/Cargo.toml

@@ -1,4 +1,5 @@
 [dependencies]
+unicode-segmentation = "1.10.1"
 
 [features]
 grapheme = []

rust/reverse-string/src/lib.rs

@@ -1,3 +1,9 @@
+use unicode_segmentation::UnicodeSegmentation;
+
 pub fn reverse(input: &str) -> String {
-    todo!("Write a function to reverse {input}");
+    if cfg!(feature = "grapheme") {
+        input.graphemes(true).rev().collect()
+    } else {
+        input.chars().rev().collect()
+    }
 }

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

@@ -19,49 +19,42 @@ fn an_empty_string() {
 }
 
 #[test]
-#[ignore]
 /// a word
 fn a_word() {
     process_reverse_case("robot", "tobor");
 }
 
 #[test]
-#[ignore]
 /// a capitalized word
 fn a_capitalized_word() {
     process_reverse_case("Ramen", "nemaR");
 }
 
 #[test]
-#[ignore]
 /// a sentence with punctuation
 fn a_sentence_with_punctuation() {
     process_reverse_case("I'm hungry!", "!yrgnuh m'I");
 }
 
 #[test]
-#[ignore]
 /// a palindrome
 fn a_palindrome() {
     process_reverse_case("racecar", "racecar");
 }
 
 #[test]
-#[ignore]
 /// an even-sized word
 fn an_even_sized_word() {
     process_reverse_case("drawer", "reward");
 }
 
 #[test]
-#[ignore]
 /// wide characters
 fn wide_characters() {
     process_reverse_case("子猫", "猫子");
 }
 
 #[test]
-#[ignore]
 #[cfg(feature = "grapheme")]
 /// grapheme clusters
 fn grapheme_clusters() {