support multi key pattern matching (#25)

internal/wechat/key/windows/v4.go

@@ -1,6 +1,8 @@
 package windows
 
 import (
+	"context"
+
 	"github.com/sjzar/chatlog/internal/wechat/decrypt"
 )
 
@@ -12,6 +14,11 @@ func NewV4Extractor() *V4Extractor {
 	return &V4Extractor{}
 }
 
+func (e *V4Extractor) SearchKey(ctx context.Context, memory []byte) (string, bool) {
+	// TODO : Implement the key search logic for V4
+	return "", false
+}
+
 func (e *V4Extractor) SetValidate(validator *decrypt.Validator) {
 	e.validator = validator
 }