cd test/photos
for i in `ls *.HEIC`
do
    _filename=`echo $i|cut -d. -f1`
    echo $_filename
    heif-convert ${_filename}.HEIC ${_filename}.jpg
done

for i in `ls *.JPG`
do 
    _filename=`echo $i|cut -d. -f1`.jpg
    echo $_filename
    mv $i $_filename
done