Support replacing homonphonic phrases (#2153)

sherpa-onnx/csrc/offline-recognizer-impl.h

@@ -10,6 +10,7 @@
 #include <vector>
 
 #include "kaldifst/csrc/text-normalizer.h"
+#include "sherpa-onnx/csrc/homophone-replacer.h"
 #include "sherpa-onnx/csrc/macros.h"
 #include "sherpa-onnx/csrc/offline-recognizer.h"
 #include "sherpa-onnx/csrc/offline-stream.h"
@@ -48,12 +49,15 @@ class OfflineRecognizerImpl {
 
   std::string ApplyInverseTextNormalization(std::string text) const;
 
+  std::string ApplyHomophoneReplacer(std::string text) const;
+
  private:
   OfflineRecognizerConfig config_;
   // for inverse text normalization. Used only if
   // config.rule_fsts is not empty or
   // config.rule_fars is not empty
   std::vector<std::unique_ptr<kaldifst::TextNormalizer>> itn_list_;
+  std::unique_ptr<HomophoneReplacer> hr_;
 };
 
 }  // namespace sherpa_onnx