input: def html_to_text(html_string: str) -> str:
      """Converts an HTML string to plain text without using any libraries.
      It ignores the content between HTML tags and only extracts the text content.
      
      >>> html_to_text('<html><body><h1>Title</h1><p>This is a paragraph.</p></body></html>')
      'TitleThis is a paragraph.'
      >>> html_to_text('<p><b>Bold text</b> and normal text.</p>')
      'Bold text and normal text.'
      """
output:     text = ''
      inside_tag = False
      
      for char in html_string:
          if char == '<':
              inside_tag = True
          elif char == '>':
              inside_tag = False
          elif not inside_tag:
              text += char
      
      return text