From 24db2050a3041270bbe85429239a4b02a4c63f0d Mon Sep 17 00:00:00 2001
From: cyz-ing <1316769374@qq.com>
Date: Fri, 24 Jan 2025 03:40:54 +0000
Subject: [PATCH] finish iterators2

---
 exercises/iterators/iterators2.rs | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/exercises/iterators/iterators2.rs b/exercises/iterators/iterators2.rs
index dda82a08..bb5d70c6 100644
--- a/exercises/iterators/iterators2.rs
+++ b/exercises/iterators/iterators2.rs
@@ -15,7 +15,9 @@ pub fn capitalize_first(input: &str) -> String {
     let mut c = input.chars();
     match c.next() {
         None => String::new(),
-        Some(first) => ???,
+        Some(first) => {
+            first.to_uppercase().to_string() + c.as_str()
+        }
     }
 }
 
@@ -24,7 +26,7 @@ pub fn capitalize_first(input: &str) -> String {
 // Return a vector of strings.
 // ["hello", "world"] -> ["Hello", "World"]
 pub fn capitalize_words_vector(words: &[&str]) -> Vec<String> {
-    vec![]
+    words.iter().map(|word| capitalize_first(word)).collect()
 }
 
 // Step 3.
@@ -32,7 +34,7 @@ pub fn capitalize_words_vector(words: &[&str]) -> Vec<String> {
 // Return a single string.
 // ["hello", " ", "world"] -> "Hello World"
 pub fn capitalize_words_string(words: &[&str]) -> String {
-    String::new()
+    words.iter().map(|word| capitalize_first(word)).collect()
 }
 
 #[cfg(test)]