Update README.md

Author: mohsinkhan85090

README.md

@@ -11,7 +11,7 @@ Each folder represents a DSA topic and contains **clean, optimized code** with c
 | 🗂️ Topic | 📊 Progress | Problems Solved |
 |-----------|------------|----------------|
 | Array | ✅ 23 | 1. Two Sum II<br>2. Move Zeroes<br>3. Remove Duplicates<br>4. Remove Element<br>5. Squares of a Sorted Array<br>6. Container With Most Water<br>7. Find Duplicate<br>8. Find Peak Element<br>9. Search Insert Position<br>10. Maximum Subarray<br>11. Maximum Product Subarray<br>12. Binary Search<br>13. Find First and Last Position<br>14. Search in Rotated Array<br>15.  Kth Largest Element<br>16. Find Pivot Index<br>17. Product of Array Except Self<br>18. Find Middle Index<br>19. Find Highest Altitude<br>20. Range Sum Query<br>21. Contains Duplicate<br>22. Majority Element<br>23. Unique Number of Occurrences |
-| String | ✅ 9 | 1. Reverse String<br>2. Reverse String II<br>3. Reverse Only Letters<br>4. Reverse Vowels<br>5. Roman to Integer<br>6. Valid Parentheses<br>7. Valid Palindrome<br>8. Valid Anagram<br>9. Find the Index of the First Occurrence in a String |
+| String | ✅ 9 | 1. Reverse String<br>2. Reverse String II<br>3. Reverse Only Letters<br>4. Reverse Vowels<br>5. Roman to Integer<br>6. Valid Parentheses<br>7. Valid Palindrome<br>8. Valid Anagram<br>9. Find the Index of the First Occurrence in a String <br>10. Is Subsequence |
 | Linked List (LL) | 🚧 0 | Coming Soon |
 | Stack & Queue | 🚧 0 | Coming Soon |
 | Tree | 🚧 0 | Coming Soon |