diff --git a/docs/chapter_backtracking/backtracking_algorithm.md b/docs/chapter_backtracking/backtracking_algorithm.md
index 19780af2..35e8c50c 100644
--- a/docs/chapter_backtracking/backtracking_algorithm.md
+++ b/docs/chapter_backtracking/backtracking_algorithm.md
@@ -562,7 +562,7 @@
 
     [class]{}-[func]{undoChoice}
 
-    [class]{}-[func]{backtrack}
+    [class]{}-[func]{backtrackIII}
     ```
 
 === "JavaScript"
diff --git a/docs/chapter_data_structure/character_encoding.assets/unicode_hello_algo.png b/docs/chapter_data_structure/character_encoding.assets/unicode_hello_algo.png
index 4eb791ab..ca3e2724 100644
Binary files a/docs/chapter_data_structure/character_encoding.assets/unicode_hello_algo.png and b/docs/chapter_data_structure/character_encoding.assets/unicode_hello_algo.png differ