Support adding punctuations to the speech recogntion result (#761)

sherpa-onnx/csrc/offline-punctuation-impl.cc

@@ -0,0 +1,22 @@
+// sherpa-onnx/csrc/offline-punctuation-impl.cc
+//
+// Copyright (c)  2024  Xiaomi Corporation
+
+#include "sherpa-onnx/csrc/offline-punctuation-impl.h"
+
+#include "sherpa-onnx/csrc/macros.h"
+#include "sherpa-onnx/csrc/offline-punctuation-ct-transformer-impl.h"
+
+namespace sherpa_onnx {
+
+std::unique_ptr<OfflinePunctuationImpl> OfflinePunctuationImpl::Create(
+    const OfflinePunctuationConfig &config) {
+  if (!config.model.ct_transformer.empty()) {
+    return std::make_unique<OfflinePunctuationCtTransformerImpl>(config);
+  }
+
+  SHERPA_ONNX_LOGE("Please specify a punctuation model! Return a null pointer");
+  return nullptr;
+}
+
+}  // namespace sherpa_onnx