input: Write a python function to generate an XML file from a list of items using xml.etree.ElementTree.
  assert generate_xml(['Item1', 'Item2', 'Item3'], 'data.xml') == None
  assert generate_xml(['Apple', 'Banana', 'Cherry'], 'fruits.xml') == None
  assert generate_xml(['A', 'B', 'C', 'D'], 'letters.xml') == None
output: import xml.etree.ElementTree as ET
  
  def generate_xml(items, filename):
      root = ET.Element("Items")
      for item in items:
          element = ET.SubElement(root, "Item")
          element.text = item
  
      tree = ET.ElementTree(root)
      tree.write(filename)