Write a function that reverses a string. The input string is given as an array of characters char[].
Do not allocate extra space for another array, you must do this by modifying the input array in-place with O(1) extra memory.
You may assume all the characters consist of printable ascii characters.
Input: ["h","e","l","l","o"] Output: ["o","l","l","e","h"]
Input: ["H","a","n","n","a","h"] Output: ["h","a","n","n","a","H"]
implSolution{pubfnreverse_string(s:&mutVec<char>){if s.len() > 0{letmut left = 0;letmut right = s.len() - 1;while left < right { s.swap(left, right); left += 1; right -= 1;}}}}