go从文件中读取json字符串并转换

将要读取的文件的一部分

[
  {
    "children": [
      {
        "children": [
          {
            "code": 110118,
            "name": "密云区"
          },
          {
            "code": 110119,
            "name": "延庆区"
          }
        ],
        "code": 110000,
        "name": "北京市"
      }
    ],
    "code": "110000",
    "name": "北京市(京)"
  },
  {
    "children": [
      {
        "children": [

          {
            "code": 120118,
            "name": "静海区"
          },
          {
            "code": 120119,
            "name": "蓟州区"
          }
        ],
        "code": 120000,
        "name": "天津市"
      }
    ],
    "code": "120000",
    "name": "天津市(津)"
  },
  {
    "children": [
      {
        "code": 820000,
        "name": "澳门特别行政区（澳）"
      }
    ],
    "code": "820000",
    "name": "澳门特别行政区(澳)"
  },
  {
    "code": "710000",
    "name": "台湾省(台)"
  }
][
  {
    "c