improve code sytle

Signed-off-by: Jack <jack.wgm@gmail.com>
friendly error formation output.

Signed-off-by: Jack <jack.wgm@gmail.com>
rename function.

Signed-off-by: Jack <jack.wgm@gmail.com>
trim left space

Signed-off-by: Jack <jack.wgm@gmail.com>
improve output stock.

Signed-off-by: Jack <jack.wgm@gmail.com>
add to_price

Signed-off-by: Jack <jack.wgm@gmail.com>
use to_price

Signed-off-by: Jack <jack.wgm@gmail.com>