project strucute refactoring

core/src/parser.rs

@@ -0,0 +1,9 @@
+use bytes::BytesMut;
+
+pub trait Parser {
+    type Error;
+    fn can_parse(bytes: &BytesMut) -> bool;
+    fn parse(bytes: &mut BytesMut) -> Result<Option<Self>, Self::Error>
+    where
+        Self: Sized;
+}