input: Write a function to find the intersection of two given sets of integers. If the sets do not have any common elements, the function should return an empty set. The function should take two sets as input and return their intersection.
  
  def intersection(set1, set2): 
     return set1 & set2
  
  assert intersection({1, 2, 3, 4}, {3, 4, 5, 6})=={3, 4}
  assert intersection({1, 2, 3}, {4, 5, 6})==set()
  assert intersection(set(), {1, 2, 3})==set()
  assert intersection({1, 2, 3}, set())==set()
output: def intersection(set1, set2): 
     return set1 & set2