Swift: Palindrome with bonus reversed() function

Palindrome.swift

// I publicly share any answers to "coding challenges" I receive as a part of the interview process
// copy/paste this into an Xcode playground or the code challenge repl of choice

// Write a function in Swift that checks if a given string is a palindrome (reads the same forwards and backwards), 
// ignoring whitespace and punctuation.

func palindrome(_ input: String) -> Bool {
  return input == String(input.reversed())
}

// there's also the extension version
extension String {
    func isPalindrome() -> Bool {
        return self == String(self.reversed())
    }
}

// if you are told specifically to not use the "reversed()" function, you could question why you want to work at a place
// that doesn't think the built-in libraries are good enough, or you could use the following function:
// this is also for the case where they tell you not to use swapAt( _, _) and is generally considered the fastest way to
// reverse a string without a library function

func myReverse(_ input: String) -> String {
    var characters = Array(input)
    var left = 0
    var right = characters.count - 1
    
    while left < right {
        let temp = characters[left]
        characters[left] = characters[right]
        characters[right] = temp
        
        left += 1
        right -= 1
    }
    
    return String(characters)
}