Problem

In AirBrush, you need a utility function to check whether a caption reads the same forward and backward. Write a function that returns True if a given string is a palindrome and False otherwise.

A palindrome should be checked exactly as given, meaning character case, spaces, and punctuation are all treated as normal characters.

Formal Specification

• Input: A string s
• Output: A boolean value
  • True if s is identical to its reverse
  • False otherwise

Examples

Example 1

• Input: s = "level"
• Output: True
• Explanation: Reading from left to right and right to left gives the same string.

Example 2

• Input: s = "Air Apps"
• Output: False
• Explanation: The reversed string is different from the original.

Constraints

• 0 <= len(s) <= 10^5
• s may contain letters, digits, spaces, and punctuation
• Return a boolean result

Try to solve this in linear time. A two-pointer approach is preferred because it avoids building a full reversed copy of the string.