Write a function called that takes a string of parentheses, and determines if the order of the parentheses is valid. The function should return true if the string is valid, and false if it's invalid.
Examples "()" => true ")(()))" => false "(" => false "(())((()())())" => true Constraints 0 <= input.length <= 100
Along with opening (() and closing ()) parenthesis, input may contain any valid ASCII characters. Furthermore, the input string may be empty and/or not contain any parentheses at all. Do not treat other forms of brackets as parentheses (e.g. [], {}, <>).
Source: https://www.codewars.com/kata/valid-parentheses/train/ruby