Update README - Topic Tags

Author: nikhil-goel11

README.md

@@ -61,6 +61,7 @@ A collection of LeetCode questions to ace the coding interview! - Created using
 | [0721-accounts-merge](https://github.com/nikhil-goel11/leetcode/tree/master/0721-accounts-merge) |
 | [0794-swim-in-rising-water](https://github.com/nikhil-goel11/leetcode/tree/master/0794-swim-in-rising-water) |
 | [1036-rotting-oranges](https://github.com/nikhil-goel11/leetcode/tree/master/1036-rotting-oranges) |
+| [1747-lexicographically-smallest-string-after-applying-operations](https://github.com/nikhil-goel11/leetcode/tree/master/1747-lexicographically-smallest-string-after-applying-operations) |
 ## Binary Tree
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 | ------- |
@@ -139,6 +140,7 @@ A collection of LeetCode questions to ace the coding interview! - Created using
 | [1302-delete-characters-to-make-fancy-string](https://github.com/nikhil-goel11/leetcode/tree/master/1302-delete-characters-to-make-fancy-string) |
 | [1350-remove-sub-folders-from-the-filesystem](https://github.com/nikhil-goel11/leetcode/tree/master/1350-remove-sub-folders-from-the-filesystem) |
 | [1353-find-resultant-array-after-removing-anagrams](https://github.com/nikhil-goel11/leetcode/tree/master/1353-find-resultant-array-after-removing-anagrams) |
+| [1747-lexicographically-smallest-string-after-applying-operations](https://github.com/nikhil-goel11/leetcode/tree/master/1747-lexicographically-smallest-string-after-applying-operations) |
 | [1818-maximum-score-from-removing-substrings](https://github.com/nikhil-goel11/leetcode/tree/master/1818-maximum-score-from-removing-substrings) |
 | [2079-delete-duplicate-folders-in-system](https://github.com/nikhil-goel11/leetcode/tree/master/2079-delete-duplicate-folders-in-system) |
 | [2346-largest-3-same-digit-number-in-string](https://github.com/nikhil-goel11/leetcode/tree/master/2346-largest-3-same-digit-number-in-string) |
@@ -235,6 +237,7 @@ A collection of LeetCode questions to ace the coding interview! - Created using
 | [0721-accounts-merge](https://github.com/nikhil-goel11/leetcode/tree/master/0721-accounts-merge) |
 | [0794-swim-in-rising-water](https://github.com/nikhil-goel11/leetcode/tree/master/0794-swim-in-rising-water) |
 | [1350-remove-sub-folders-from-the-filesystem](https://github.com/nikhil-goel11/leetcode/tree/master/1350-remove-sub-folders-from-the-filesystem) |
+| [1747-lexicographically-smallest-string-after-applying-operations](https://github.com/nikhil-goel11/leetcode/tree/master/1747-lexicographically-smallest-string-after-applying-operations) |
 | [2400-minimum-score-after-removals-on-a-tree](https://github.com/nikhil-goel11/leetcode/tree/master/2400-minimum-score-after-removals-on-a-tree) |
 ## Binary Search Tree
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@@ -926,6 +929,7 @@ A collection of LeetCode questions to ace the coding interview! - Created using
 | ------- |
 | [0204-count-primes](https://github.com/nikhil-goel11/leetcode/tree/master/0204-count-primes) |
 | [0900-reordered-power-of-2](https://github.com/nikhil-goel11/leetcode/tree/master/0900-reordered-power-of-2) |
+| [1747-lexicographically-smallest-string-after-applying-operations](https://github.com/nikhil-goel11/leetcode/tree/master/1747-lexicographically-smallest-string-after-applying-operations) |
 | [2170-count-number-of-maximum-bitwise-or-subsets](https://github.com/nikhil-goel11/leetcode/tree/master/2170-count-number-of-maximum-bitwise-or-subsets) |
 | [2837-minimum-operations-to-make-the-integer-zero](https://github.com/nikhil-goel11/leetcode/tree/master/2837-minimum-operations-to-make-the-integer-zero) |
 | [3277-find-the-number-of-ways-to-place-people-ii](https://github.com/nikhil-goel11/leetcode/tree/master/3277-find-the-number-of-ways-to-place-people-ii) |