From ee3d71184ffd782327a152b89bc22af4db1b5467 Mon Sep 17 00:00:00 2001
From: Truong Nhan Nguyen <nhantruongnguyen123@gmail.com>
Date: Sun, 13 Oct 2024 21:06:11 +0700
Subject: [PATCH] chore: use is_whitespace to check whitespace

---
 src/string/isogram.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/string/isogram.rs b/src/string/isogram.rs
index 1be6020cbc5..30b8d66bdff 100644
--- a/src/string/isogram.rs
+++ b/src/string/isogram.rs
@@ -32,7 +32,7 @@ fn count_letters(s: &str) -> Result<HashMap<char, usize>, IsogramError> {
     let mut letter_counts = HashMap::new();
 
     for ch in s.to_ascii_lowercase().chars() {
-        if !ch.is_ascii_alphabetic() && ch != ' ' {
+        if !ch.is_ascii_alphabetic() && !ch.is_whitespace() {
             return Err(IsogramError::NonAlphabeticCharacter);
         }