error handling and icmp decode on verbose error

.vscode/settings.json

@@ -1,6 +1,13 @@
 {
     "C_Cpp.errorSquiggles": "disabled",
     "files.associations": {
-        "ip.h": "c"
+        "ip.h": "c",
+        "system_error": "c",
+        "array": "c",
+        "compare": "c",
+        "functional": "c",
+        "tuple": "c",
+        "type_traits": "c",
+        "utility": "c"
     }
 }