Refactor mql4 code ("working too slowly" & "array out of range"), change ext int variable into custom indicator input

This is only for highly experienced programmers who know how to work with custom libraries, who know how to update functionality, increase indicator speed by refactoring code, and fix array-out-of-range errors from previous MT4 versions to the current one. Please do not apply when you don't qualify. Thank you.

Description:

A custom indicator, called "!adaptor.mq4", which is calculated on the first buffer of another custom indicator called "# another oscillator VII", uses a custom library called "Calc_Fit_For_Bar.mq4", was written long time ago. This indicator ("!adaptor") needs updating and adjustment. It is an adaptive digital filter, calculated on an oscillator. The way it adapts is calculated in a custom library.

There are 2 issues:

-> First the 2 problems:

1) error messages:

"! adaptor EURUSD,H1: array out of range in '! adaptor.mq4' (65,39)"

and:

"GBPUSD,M30: indicator(s) working too slowly, total calculation time 2906 ms"

So it is working too slowly, and has an array out of range error: this needs to be fixed, so it works correctly in the latest MT4 version.

-> The required changes:

2) It requires adjustment: Instead of an external integer variable, the extern int "WindowLength" should be able to take the input from a custom indicator-rounded- integer value: using MathRound, which I can easily edit on 1 single line in the code. Could be a trivial input in the prototype, just to show the functionality.

The custom library will be provided after acceptance of the project.

Thank you.