input: Write a function to identify if a string has matching parentheses. If the string has matching parentheses return True else return False. If the string is empty then return False.
  assert matching_paren("()")==True
  assert matching_paren("(()")==False
  assert matching_paren("())")==False
  assert matching_paren("((())")==False
  assert matching_paren("")==False
output: def matching_paren(s):
      if not s:
          return False
      stack = []
      for char in s:
          if char == '(':
              stack.append(char)
          elif char == ')':
              if not stack:
                  return False
              stack.pop()
      return len(stack) == 0