input: Write a function to clean up a list of emails and put them into a new list. The function should remove any characters after the '+' sign and also remove '.uk' from email addresses. If the input list is empty, return an empty list.
  def clean_email_list(emails):
      clean_list = []
      for email in emails:
          email_without_plus = email.split('+')[0]
          email_without_dot_uk = email_without_plus.split('.uk')[0]
          clean_list.append(email_without_dot_uk)
      return clean_list
  
  assert clean_email_list(['bob@example.com', 'alice+bob@cafe.com', 'bob@gmail.com.uk', 'bob+alice@example'])==['bob@example.com', 'alice@cafe.com', 'bob@gmail.com', 'bob@example']
  assert clean_email_list([])==[]
output: def clean_email_list(emails):
      clean_list = []
      for email in emails:
          email_without_plus = email.split('+')[0]
          email_without_dot_uk = email_without_plus.split('.uk')[0]
          clean_list.append(email_without_dot_uk)
      return clean_list