major refactor

controllers/gddAccumulatedController.js

controllers/gddController.js

controllers/gddNormalController.js

gddController.js

lib/utils.js

routes.js

routes/api/product/accumulated/accumulated_year.js

routes/api/product/daily/daily_year.js

routes/api/product/normal/normal.js

routes/api/product/product_index.js

routes/index.js

server.js

swagger_definition.yaml