fix normpath (again) to escape slash

Author: leofang

.github/actions/fetch_ctk/action.yml

@@ -151,9 +151,12 @@ runs:
           CUDA_PATH=$(realpath "./cuda_toolkit")
           echo "LD_LIBRARY_PATH=${LD_LIBRARY_PATH:-}:${CUDA_PATH}/lib:${CUDA_PATH}/nvvm/lib64" >> $GITHUB_ENV
         elif [[ "${{ inputs.host-platform }}" == win* ]]; then
-          CUDA_PATH=$(cygpath -w $(realpath "./cuda_toolkit"))
-          echo "$(cygpath -w ${CUDA_PATH}/bin)" >> $GITHUB_PATH
-          echo "$(cygpath -w $CUDA_PATH/nvvm/bin)" >> $GITHUB_PATH
+          function normpath() {
+            echo "$(echo $(cygpath -w $1) | sed 's/\\/\\\\/g')"
+          }
+          CUDA_PATH=$(normpath $(realpath "./cuda_toolkit"))
+          echo "$(normpath ${CUDA_PATH}/bin)" >> $GITHUB_PATH
+          echo "$(normpath $CUDA_PATH/nvvm/bin)" >> $GITHUB_PATH
         fi
         echo "CUDA_PATH=${CUDA_PATH}" >> $GITHUB_ENV
         echo "CUDA_HOME=${CUDA_PATH}" >> $GITHUB_ENV