翻转字符串OJ

class Solution {
	public:
		void reverseString(vector<char>& s) 
		{
			if (s.empty())
			{
				return s;
			}

			size_t start = 0;
			size_t end = s.size() - 1;

			while (start < end)
			{
				s.swap(s[start], s[end]);
				start++:
				end--;
			}
			return s;

		}
	};