Add C API for speech enhancement GTCRN models (#1984)

.github/workflows/c-api.yaml

@@ -79,6 +79,40 @@ jobs:
             otool -L ./install/lib/libsherpa-onnx-c-api.dylib
           fi
 
+      - name: Test speech enhancement (GTCRN)
+        shell: bash
+        run: |
+          name=speech-enhancement-gtcrn-c-api
+          gcc -o $name ./c-api-examples/$name.c \
+            -I ./build/install/include \
+            -L ./build/install/lib/ \
+            -l sherpa-onnx-c-api \
+            -l onnxruntime
+
+          ls -lh $name
+
+          if [[ ${{ matrix.os }} == ubuntu-latest || ${{ matrix.os }} == ubuntu-22.04-arm ]]; then
+            ldd ./$name
+            echo "----"
+            readelf -d ./$name
+          fi
+          curl -SL -O https://github.com/k2-fsa/sherpa-onnx/releases/download/speech-enhancement-models/gtcrn_simple.onnx
+          curl -SL -O https://github.com/k2-fsa/sherpa-onnx/releases/download/speech-enhancement-models/inp_16k.wav
+
+          export LD_LIBRARY_PATH=$PWD/build/install/lib:$LD_LIBRARY_PATH
+          export DYLD_LIBRARY_PATH=$PWD/build/install/lib:$DYLD_LIBRARY_PATH
+
+          ./$name
+          rm -fv *.onnx
+          mkdir denoised-wavs
+          cp -v inp_16k.wav denoised-wavs
+          cp -v enhanced_16k.wav denoised-wavs
+
+      - uses: actions/upload-artifact@v4
+        with:
+          name: denoised-wavs-${{ matrix.os }}
+          path: ./denoised-wavs/*.wav
+
       - name: Test FireRedAsr
         shell: bash
         run: |