Update README.md

Author: Depth-monster

README.md

@@ -5,10 +5,9 @@
 <!--module 3 starts-->
 <details>
 <summary> <strong>3. Longest Substring Without Repeating Characters</strong> </summary>
-Given a string s, find the length of the longest 
-substring
- without repeating characters.
 ```typescript
+Given a string s, find the length of the longest substring without repeating characters.
+
 Example 1:
 Input: s = "abcabcbb"
 Output: 3