Bug Report for string-encode-and-decode

Bug Report for https://neetcode.io/problems/string-encode-and-decode

IDE cannot recognize StringReader and it cannot be imported.

<img width="809" height="1296" alt="Image" src="https://github.com/user-attachments/assets/15a817c3-37e8-4c11-ab7a-f2db67d30175" />