input: Write a python function to check if a list of strings are all palindromes.
  assert palindrome_checker(['abba', 'bob', 'acca'])==True
  assert palindrome_checker(['abba', 'hello', 'acca'])==False
  assert palindrome_checker(['racecar', 'madam', 'level'])==True
output: def palindrome_checker(strings):
      return all(s == s[::-1] for s in strings)