input: Write a python function to count occurrences of a specific character in a list.
  assert count_char(['a', 'b', 'c', 'a', 'a'], 'a') == 3
  assert count_char(['x', 'y', 'z', 'x'], 'x') == 2
  assert count_char(['1', '2', '3', '1', '1', '2'], '2') == 2
output: def count_char(lst, char):
      return lst.count(char)