Modify file structure to separate python and cpp code (#223)

Modify code structure

fastdeploy/text/preprocessor/preprocessor.h

@@ -0,0 +1,34 @@
+// Copyright (c) 2022 PaddlePaddle Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#pragma once
+
+#include <memory>
+#include <vector>
+#include "fastdeploy/core/fd_tensor.h"
+#include "fastdeploy/utils/utils.h"
+
+namespace fastdeploy {
+namespace text {
+
+class Preprocessor {
+ public:
+  virtual bool Encode(const std::string& raw_text,
+                      std::vector<FDTensor>* encoded_tensor) const;
+  virtual bool EncodeBatch(const std::vector<std::string>& raw_texts,
+                           std::vector<FDTensor>* encoded_tensor) const;
+};
+
+}  // namespace text
+}  // namespace fastdeploy