feat:add runtime error code

pkg/models/result.go

@@ -13,8 +13,9 @@ const (
 	CompilationError        Result = 2
 	MemoryLimitExceeded     Result = 3
 	TimeLimitExceeded       Result = 4
-	SystemFailDuringTesting Result = 5
-	Testing                 Result = 6
+    RuntimeError            Result = 5
+	SystemFailDuringTesting Result = 6
+	Testing                 Result = 7
 )
 
 var ErrBadResult = errors.New("bad result")