input: Write a python function to fetch the current stock price of a given symbol using the Yahoo Finance API.
  assert get_stock_price('AAPL') > 0
  assert get_stock_price('GOOGL') > 0
  assert get_stock_price('AMZN') > 0
output: def get_stock_price(symbol):
      import requests
      url = f'https://query1.finance.yahoo.com/v7/finance/quote?symbols={symbol}'
      response = requests.get(url)
      data = response.json()
      return data['quoteResponse']['result'][0]['regularMarketPrice']