1. Reverse a String
2. Check if a String is a Palindrome
3. Remove Duplicates from a String
4. Find the First Non-Repeating Character
5. Count the Occurrences of Each Character
6. Reverse Words in a Sentence
7. Check if Two Strings are Anagrams
8. Find the Longest Substring Without Repeating Characters
9. Convert a String to an Integer (atoi Implementation)
10. Compress a String (Run-Length Encoding)
11. Find the Most Frequent Character
12. Find All Substrings of a Given String
13. Check if a String is a Rotation of Another String
14. Remove All White Spaces from a String
15. Check if a String is a Valid Shuffle of Two Strings
16. Convert a String to Title Case
17. Find the Longest Common Prefix
18. Convert a String to a Character Array
19. Replace Spaces with %20 (URL Encoding)
20. Convert a Sentence into an Acronym
21. Check if a String Contains Only Digits
22. Find the Number of Words in a String
23. Remove a Given Character from a String
24. Find the Shortest Word in a String
25. Find the Longest Palindromic Substring
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