Merge pull request #1907 from MuraliDharan7/add-string-problems

String Problems added

Author: ajay-dhangar

dsa-problems/String-Problems/Easy-problems.md

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+| Problem                                                   | Difficulty Level | Problem Link                                               |
+|-----------------------------------------------------------|------------------|------------------------------------------------------------|
+| [Remove outermost Parenthesis](https://www.geeksforgeeks.org/remove-outermost-parentheses/) | Easy             | [Problem Link](https://practice.geeksforgeeks.org/problems/remove-outermost-parentheses/1)       |
+| [Reverse words in a given string / Palindrome Check](https://www.geeksforgeeks.org/reverse-words-in-a-given-string/) | Easy             | [Problem Link](https://practice.geeksforgeeks.org/problems/reverse-words-in-a-given-string/0)    |
+| [Largest odd number in a string](https://www.geeksforgeeks.org/largest-odd-number-in-string/) | Easy             | [Problem Link](https://practice.geeksforgeeks.org/problems/largest-odd-number-in-string/1)       |
+| [Longest Common Prefix](https://www.geeksforgeeks.org/longest-common-prefix-using-word-by-word-matching/) | Easy             | [Problem Link](https://practice.geeksforgeeks.org/problems/longest-common-prefix-in-an-array/0)  |
+| [Isomorphic String](https://www.geeksforgeeks.org/check-if-two-given-strings-are-isomorphic-to-each-other/) | Easy             | [Problem Link](https://practice.geeksforgeeks.org/problems/isomorphic-strings/0)                 |
+| [Check whether one string is a rotation of another](https://www.geeksforgeeks.org/check-if-a-string-is-rotation-of-another-string/) | Medium           | [Problem Link](https://practice.geeksforgeeks.org/problems/check-if-string-is-rotated-by-two-places/0) |
+| [Check if two strings are anagram of each other](https://www.geeksforgeeks.org/check-whether-two-strings-are-anagram-of-each-other/) | Medium           | [Problem Link](https://practice.geeksforgeeks.org/problems/anagram-1587115620/1)                 |

dsa-problems/String-Problems/Medium-problems.md

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+| Problem                                                   | Difficulty Level | Problem Link                                               |
+|-----------------------------------------------------------|------------------|------------------------------------------------------------|
+| [Sort Characters by frequency](https://www.geeksforgeeks.org/sort-characters-by-frequency/) | Easy             | [Problem Link](https://practice.geeksforgeeks.org/problems/sort-characters-by-frequency/1)      |
+| [Maximum Nesting Depth of Parenthesis](https://www.geeksforgeeks.org/maximum-nesting-depth-of-the-parentheses/) | Easy             | [Problem Link](https://practice.geeksforgeeks.org/problems/maximum-nesting-depth/1)             |
+| [Roman Number to Integer and vice versa](https://www.geeksforgeeks.org/roman-number-to-integer-and-vice-versa/) | Easy             | [Problem Link](https://practice.geeksforgeeks.org/problems/roman-number-to-integer-and-vice-versa/1) |
+| [Implement Atoi](https://www.geeksforgeeks.org/implement-atoi/) | Medium           | [Problem Link](https://practice.geeksforgeeks.org/problems/implement-atoi/1)                    |
+| [Count Number of Substrings](https://www.geeksforgeeks.org/count-number-of-substrings-with-exactly-k-distinct-characters/) | Medium           | [Problem Link](https://practice.geeksforgeeks.org/problems/count-number-of-substrings/1)        |
+| [Longest Palindromic Substring (Do it without DP)](https://www.geeksforgeeks.org/longest-palindromic-substring-set-2/) | Hard             | [Problem Link](https://practice.geeksforgeeks.org/problems/longest-palindromic-substring/0)     |
+| [Sum of Beauty of all substrings](https://www.geeksforgeeks.org/sum-of-beauty-of-all-substrings-of-a-string/) | Medium           | [Problem Link](https://practice.geeksforgeeks.org/problems/sum-of-beauty-of-all-substrings/1)   |
+| [Reverse Every Word in A String](https://www.geeksforgeeks.org/reverse-words-in-a-given-string/) | Easy             | [Problem Link](https://practice.geeksforgeeks.org/problems/reverse-words-in-a-given-string/0)   |

dsa-problems/String-Problems/_category_.json

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+{
+    "label": "String Problems",
+    "position": 4,
+    "link": {
+      "type": "generated-index",
+      "description": "You will learn about the String problems of Data Structures and Algorithms."
+    }
+  }