input: Write a python function to remove text within parentheses from a string.
  assert remove_parentheses("example (text) example") == "example  example"
  assert remove_parentheses("(hello)world") == "world"
  assert remove_parentheses("no parentheses here") == "no parentheses here"
  assert remove_parentheses("multiple (set of) parentheses (here)") == "multiple  parentheses "
output: def remove_parentheses(s):
      result = []
      skip = 0
      for char in s:
          if char == '(':
              skip += 1
          elif char == ')':
              skip -= 1
          elif skip == 0:
              result.append(char)
      return ''.join(result)