Reverse String

344. Reverse String

Write a function that takes a string as input and returns the string reversed.

Example:
Given s = "hello", return "olleh".

class Solution {
    func reverseString(_ s: inout [Character]) {
        if s.isEmpty {
            return
        }
        
        var i = 0, j = s.count - 1
        while i < j {
            s.swapAt(i, j)
            i += 1
            j -= 1
        }
    }
}

public class Solution {
    public String reverseString(String s) {
        if (s == null || s.length() == 0) {
            return "";
        }
        
        int i = 0, j = s.length() - 1;
        char[] chars = s.toCharArray();
        
        while (i < j) {
            char temp = chars[i];
            chars[i] = chars[j];
            chars[j] = temp;
            
            i++;
            j--;
        }
        
        return new String(chars);
    }
}

Hope this helps,
Michael