report

type EtfIntervalReport struct {
	IntervalInDays                                            int
	MinPrice, MaxPrice, IntervalChange, IntervalPercentChange float32
}

type EtfReport struct {
	Symbol                              string
	CurrentPrice, Change, PercentChange float32
	IntervalReports                     []EtfIntervalReport
}

type ReportGenerator struct {
	Intervals []int
}

type ReportGeneratorOption func(*ReportGenerator)