input: Write a python function to fetch and print the text inside a div with a specific class from a given URL using BeautifulSoup.
  assert fetch_div_text('https://example.com', 'text') == 'Example Domain'
  assert fetch_div_text('https://example.com', 'nonexistent') == None
  assert fetch_div_text('https://example.com', 'another-class') == 'Some other text'
output: def fetch_div_text(url, class_name):
      import requests
      from bs4 import BeautifulSoup
  
      response = requests.get(url)
      soup = BeautifulSoup(response.content, 'html.parser')
      div = soup.find('div', class_=class_name)
      if div:
          return div.get_text(strip=True)
      return None