EASY LEVEL (1–10)

1. Reverse String

   Problem: Given a string s, return the reversed string.

Input:
s = "hello"

Output:
"olleh"

1. Palindrome Check

   Problem: Determine whether a string s is a palindrome.

Input:
s = "madam"

Output:
true

1. Count Vowels

   Problem: Count total vowels in string s.

Input:
s = "hello"

Output:
2

1. Count Consonants

   Problem: Count total consonants in s.

Input:
s = "hello"

Output:
3

1. Count Spaces

   Problem: Return number of spaces in string s.

Input:
s = "hello world"

Output:
1

1. Convert to Uppercase

   Problem: Convert all characters of s to uppercase.

Input:
s = "python"

Output:
"PYTHON"

1. Convert to Lowercase

   Problem: Convert all characters of s to lowercase.