def simplify_char(c):
    mapping = {'東': '东', '銅': '铜', '童': '童'} # add others if needed
    return mapping.get(c, c)

num_map = {'一':'1', '二':'2', '三':'3', '四':'4', '五':'5', '六':'6', '七':'7', '八':'8', '九':'9'}

# "01之一"
# If vol_m = re.search(r"卷(.)之(.)", text)
# "0" + num_map[vol_m.group(1)] + "之" + vol_m.group(2)