parameter: file_path - path to cache file
	return: data after parsing json file

def read(filename='cache'):
	"""
	parameter: file_path - path to cache file
	return: data after parsing json file"""
	cache_path = get_cache_path(filename)
	if not os.path.exists(cache_path) or os.stat(cache_path).st_size == 0:
		return None
	with open(cache_path, 'r') as file:
		return json.load(file)