Code Rewrite to support multi instances

.vscode/launch.json

@@ -0,0 +1,15 @@
+{
+    "version": "0.2.0",
+    "configurations": [
+      {
+        "name": "Python: Main from Root",
+        "type": "python",
+        "request": "launch",
+        "program": "${workspaceFolder}/main.py",
+        "cwd": "${workspaceFolder}",
+        "env": {
+          "PYTHONPATH": "${workspaceFolder}"
+        }
+      }
+    ]
+  }