input: Write a function to identify the characters in a given alphabet and return them as a list. If the given alphabet is empty, return an empty list.
  assert identify_characters('ABCDEFGHIJKLMNOPQRSTUVWXYZ') == ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z']
  assert identify_characters('') == []
output: def identify_characters(alphabet):
      return list(alphabet)