input: Write a python function to parse web HTML and extract text using BeautifulSoup.
  assert parse_web_html('<html><body><h1>Title</h1><p>This is a paragraph.</p></body></html>') == 'TitleThis is a paragraph.'
  assert parse_web_html('<div><span>Some text</span></div>') == 'Some text'
  assert parse_web_html('<html><body><h1>Header</h1><div>Another text</div></body></html>') == 'HeaderAnother text'
output: def parse_web_html(html):
      from bs4 import BeautifulSoup
      soup = BeautifulSoup(html, 'html.parser')
      return ''.join(soup.stripped_strings)