input: Write a function named `identify_characters` that takes a single argument `alphabet` which is a string of characters from a given alphabet. The function should identify each character in the alphabet and return a list of those characters. If the input alphabet string is empty, the function should 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)