input: Write a python function to fetch and parse a webpage, then extract data from HTML elements with a specific class name using BeautifulSoup.
  assert len(data_extraction('https://example.com')) > 0
  assert isinstance(data_extraction('https://example.com')[0], BeautifulSoup)
output: def data_extraction(url):
      import requests
      from bs4 import BeautifulSoup
  
      response = requests.get(url)
      soup = BeautifulSoup(response.content, 'html.parser')
  
      elements = soup.find_all(class_='specific-class-name')
      return elements