rearrange builtins

object/error.go

@@ -0,0 +1,18 @@
+package object
+
+type Error struct {
+	Message string
+}
+
+func (e *Error) Type() ObjectType {
+	return ERROR_OBJ
+}
+func (e *Error) Inspect() string {
+	return "Error: " + e.Message
+}
+func (e *Error) Clone() Object {
+	return &Error{Message: e.Message}
+}
+func (e *Error) String() string {
+	return e.Message
+}