input: Write a python function to add a prefix and a suffix to each element in a list.
  assert add_prefix_suffix(["apple", "banana", "cherry"], "pre-", "-suf") == ["pre-apple-suf", "pre-banana-suf", "pre-cherry-suf"]
  assert add_prefix_suffix(["cat", "dog", "fish"], "animal-", "-end") == ["animal-cat-end", "animal-dog-end", "animal-fish-end"]
  assert add_prefix_suffix(["1", "2", "3"], "num-", "-num") == ["num-1-num", "num-2-num", "num-3-num"]
output: def add_prefix_suffix(lst, prefix, suffix):
      return [prefix + item + suffix for item in lst]