input: Write a python function to find the intersection of two sets.
  assert find_intersection({1,2,3,4,5}, {3,4,5,6,7}) == {3,4,5}
  assert find_intersection({10,20,30}, {20,30,40}) == {20,30}
  assert find_intersection({1,2,3}, {4,5,6}) == set()
output: def find_intersection(set1, set2):
      return set1 & set2