def double_char(str):

  new_string = ''

  for letter in str: 

    new_string += letter*2

  return new_string

def count_hi(str):

  return str.count('hi')

def cat_dog(str):

  return str.count('cat') == str.count('dog')

def count_code(str):

  count = 0 

  words = ['co'+x+'e' for x in 'abcdefghijklmnopqrstuvwxyz']

  for word in words: 

    numbers = str.count(word)

    count += numbers

  return count

def end_other(a, b):

  a,b = a.lower(),b.lower() 

  if a.endswith(b) or b.endswith(a):

    return True 

  return False

def xyz_there(str):

  a,b = str.count('xyz'),str.count('.xyz')

  if a!=b:

    return True 

  return False