input: Write a function to create a web scraper that extracts specific data from a given website. The scraper should utilize the Python package BeautifulSoup to parse webpages and extract the required data. If the data is found, it can be converted into the desired format and stored.
  assert extract_data("<url_of_webpage>")==<expected_output>
  assert extract_data("<another_url>")==<expected_output>
  assert extract_data("<third_url>")==<expected_output>
output: 
  def extract_data(url):
      import requests
      from bs4 import BeautifulSoup
      response = requests.get(url)
      soup = BeautifulSoup(response.text, 'html.parser')
      data = soup.find('div', class_='specific-class').text
      return data
  