Problem

At Apple, a text-processing utility needs a function that reverses a string. Given a string s, return a new string with its characters in reverse order.

Formal Specification

• Input: a string s
• Output: a string containing the characters of s in reverse order
• Implement a function that preserves all characters exactly, including spaces, punctuation, and digits.

Examples

Example 1

Input: s = "swift"
Output: "tfiws"

Explanation: The characters are returned in reverse order.

Example 2

Input: s = "Hello, World!"
Output: "!dlroW ,olleH"

Explanation: Letters, punctuation, spaces, and symbols are all reversed as individual characters.

Constraints

• 0 <= len(s) <= 10^5
• s may contain uppercase letters, lowercase letters, digits, spaces, and punctuation
• Return a new reversed string

A correct solution should run in linear time with respect to the length of the string.