Delete Sheet index error

[ogimenezb]

Description

When you delete a sheet then create a new one and then delete again there is an out of index error

Steps to reproduce the issue:

func main() {
    xlsx := excelize.NewFile()
    // Create a new sheet.
	xlsx.NewSheet("Sheet2")
	xlsx.NewSheet("Sheet3")
	xlsx.NewSheet("Sheet4")
	fmt.Println("init ", xlsx.GetSheetMap())
	xlsx.DeleteSheet("Sheet3")
	fmt.Println("delete ", xlsx.GetSheetMap())
	xlsx.NewSheet("Sheet5")
	fmt.Println("new ", xlsx.GetSheetMap())
	xlsx.DeleteSheet("Sheet5")
	fmt.Println("delete ", xlsx.GetSheetMap())
    err := xlsx.SaveAs("./Book1.xlsx")
    if err != nil {
        fmt.Println(err)
    }
}

Describe the results you received:

$ go run main.go
init  map[1:Sheet1 2:Sheet2 3:Sheet3 4:Sheet4]
delete  map[1:Sheet1 2:Sheet2 4:Sheet4]
new  map[1:Sheet1 2:Sheet2 4:Sheet5]
panic: runtime error: slice bounds out of range

goroutine 1 [running]:
github.com/360EntSecGroup-Skylar/excelize.(*File).deleteSheetFromContentTypes(0xc0002a2000, 0xc00005cde0, 0x15)
        C:/Users/xx/go/pkg/mod/github.com/360!ent!sec!group-!skylar/[email protected]/sheet.go:439 +0x2cd
github.com/360EntSecGroup-Skylar/excelize.(*File).DeleteSheet(0xc0002a2000, 0x6a15ea, 0x6)
        C:/Users/xx/go/pkg/mod/github.com/360!ent!sec!group-!skylar/[email protected]/sheet.go:408 +0x45b
main.main()
        C:/data/main.go:25 +0x275
exit status 2

Describe the results you expected:
To not have an error
Output of go version:

go version go1.11.1 windows/amd64

[xuri]

Hi @ogimenezb, thanks for your issue. I have fixed it. Please try to upgrade the library to the last version.

[ogimenezb]

Hi @xuri, thanks for your quick fix.

Just tested the latest version and works perfectly!