def errorIfNoSubstringFound(pattern, file_path, error_message):
    return ([] if (pattern in readFile(file_path)) else [((file_path + ': ') + error_message)])
def errorIfNoSubstringFound(pattern, file_path, error_message):
    return ([] if (pattern in readFile(file_path)) else [((file_path + ': ') + error_message)])