7. Attendance Award Eligibility

11. Binary Substrings

20. Check Anagram

21. Check for Spaces

25. Check Isomorphic Strings

26. Check Last Character

29. Check String Length

33. Compare String Lengths

35. Concatenate First and Last Characters

36. Concatenate First and Last Name

40. Convert Number to Excel Column

41. Convert Timecode to Seconds

44. Count Matching Patterns

45. Count Occurrences

48. Count Vowels

49. Count Words

58. Fizz Buzz

66. Identify Extra Character

77. Is Palindrome

90. Match Words Pattern

118. Number to Hexadecimal

122. Pattern Index

132. Remove First N Characters

135. Remove Vowels

137. Repeated Substring Pattern

138. Repeat String

141. Return to Origin

144. Reverse Letter Cases

147. Reverse Only English Letters

148. Reverse Words in Sentence

156. String Addition

157. String Comparison After Backspaces

158. String Subsequence

162. Symmetrical Numbers

166. Unique Character

171. Validate Capitalization Usage

175. Valid Palindrome II

176. Valid Parentheses