Fix minor issues and create a .clangd config for different builddirs

.vscode/c_cpp_properties.json

@@ -5,11 +5,12 @@
       "compilerPath": "/usr/bin/clang",
       "cStandard": "c11",
       "cppStandard": "c++20",
-      "compileCommands": "${workspaceFolder}/builddir/compile_commands.json",
       "browse": {
-        "path": ["${workspaceFolder}"]
+        "path": [
+          "${workspaceFolder}"
+        ]
       }
     }
   ],
   "version": 4
-}
+}