def get_ifndef_symbol(lines):
    index = [i for (i, s) in enumerate(lines) if ('#ifndef ' in s)]
    if (len(index) == 0):
        return ('', (- 1))
    result = re.search('#ifndef (.*)\n', lines[index[0]])
    return (result.group(1), index[0])
def get_ifndef_symbol(lines):
    index = [i for (i, s) in enumerate(lines) if ('#ifndef ' in s)]
    if (len(index) == 0):
        return (, (- 1))
    result = re.search('#ifndef (.*)\n', lines[index[0]])
    return (result.group(1), index[0])