input: Write a python function to generate a URL for a product listing using the given product name, category, and price.
  assert generateURL('Tulip Breeze Necklace', 'Jewelry', 45) == 'https://www.etsy.com/listing/tulip-breeze-necklace-45-jewelry/tulip-breeze-necklace'
  assert generateURL('Cozy Winter Sweater', 'Clothing', 75) == 'https://www.etsy.com/listing/cozy-winter-sweater-75-clothing/cozy-winter-sweater'
  assert generateURL('Handmade Ceramic Vase', 'Home Decor', 120) == 'https://www.etsy.com/listing/handmade-ceramic-vase-120-home-decor/handmade-ceramic-vase'
output: def generateURL(product_name, category, price):
      formatted_name = product_name.lower().replace(' ', '-')
      return f'https://www.etsy.com/listing/{formatted_name}-{price}-{category.lower()}/{formatted_name}'