strategy: cleanup for the further development

Cleanup to keep the main framework (workflow) as clear as possible, and this
will make the future development easier.

1, Change the format to import moudles.
2, Remove the useless commentaries and codes.
3, Reformat the definition to calls.

Signed-off-by: Zhengwang Ruan <ruan.zhengwang@gmail.com>
strategy:turtle: separate TurtData as an independent module

TurtData is to process the data used for Trutle, but to keep Turtle as clear as
possible will be easier to extend its functionality by integrating more features
. So separate TurtData from Trutle as an independent module.

Signed-off-by: Zhengwang Ruan <ruan.zhengwang@gmail.com>
strategy:turtle/turt1: remove calls like lowestBeforeDate from turtle

The calls like lowestBeforeDate() were used to simplify the usages to the same
calls defined in Data, but they need extra efforts to maintain now. They seem
will not be valuable again, so remove it from turtle.

Signed-off-by: Zhengwang Ruan <ruan.zhengwang@gmail.com>