String

1. Print the first unique or non-repeated character of the string.
2. Print all the duplicate characters of the string.
3. Write a program to reverse a string.
4. Check a String is Palindrome or Not.
5. Check if a string contains only digits.
6. Check if two strings are anagrams of each other.
7. Count the number of vowels and consonants in a given string.
8. Count the occurrence of a given character in a string.
9. Find all permutations of a string.
10. Check if two strings are a rotation of each other.
    
11. Find the longest common substring between two strings.
12. Separate digits, characters, and special characters from a mixed string.
13. Write a function to replace all occurrence of a character with another character and vice versa in a string.
14. Write a method to move hyphens to the left and characters to the right in a string.
15. Write a program to check for balanced parenthesis.
16. Char sum.
17. Write a method to Mirror Encrypt a String.
18. Print all possible rotations of a string.
19. Reverse each word of the sentence without changing their order.
20. Longest Palindromic Substring.
21. Longest common prefix.
22. Check If a Word Occurs As a Prefix of Any Word in a Sentence.
23. How to sort a string array by 2nd char of each string in the array ?

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