It's hard, isn't it? It's a bit difficult to charge for a set of software. I know what you mean is to write an index formula yourself and then completely follow the formula of how much profit ratio is greater than that to overcome human greed and instability, just like the previous turtle rule, but there are many ways to debug the existing index formula without writing an index, such as the 3-line inversion rule. Constant revision is also a good way to improve profitability. Finally, don't adopt the above suggestions before writing successfully.