input: Write a function to check for palindromes in a list of strings.
  assert palindrome_checker(['racecar', 'level', 'toronto', 'bob', 'noon']) == ['racecar', 'level', 'bob', 'noon']
  assert palindrome_checker(['hello', 'world', 'python', 'madam', 'refer']) == ['madam', 'refer']
  assert palindrome_checker(['abc', 'def', 'ghi']) == []
output: def palindrome_checker(strings):
      return [s for s in strings if s == s[::-1]]