file node bug fixed

data/3.C语言高阶/5.文件/1.文件的基本操作/file01.json

 {
     "type": "code_options",
     "author": "幻灰龙",
-    "source": "file01.md"
+    "source": "file01.md",
+    "exercise_id": "2e78bd9001cc45049141672c176a232f"
 }
\ No newline at end of file

data/3.C语言高阶/5.文件/1.文件的基本操作/file02.json

 {
     "type": "code_options",
     "author": "幻灰龙",
-    "source": "file02.md"
+    "source": "file02.md",
+    "exercise_id": "3f8e44050e62451cae8185f9f48ab57b"
 }
\ No newline at end of file

data/3.C语言高阶/5.文件/1.文件的基本操作/file03.json

 {
     "type": "code_options",
     "author": "幻灰龙",
-    "source": "file03.md"
+    "source": "file03.md",
+    "exercise_id": "941a3f5a05d54ef9ac03b9be3ee42d85"
 }
\ No newline at end of file