update transducer demo

shixian.shi

2024-02-21 ec4ca408bf9656cdb2a39d1d122936931f3478a9

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add_library(csrc STATIC
        feature-fbank.cc
        feature-functions.cc
        feature-window.cc
        fftsg.c
        mel-computations.cc
        online-feature.cc
        rfft.cc)