Convert a large floating number to currency readable string

format.go

/*
This is about format a large floating number to a readable currency string
Ex - 1684748483.3454
Output - 1,684,748,483.34

You can customize the decimals part to your needs.
*/
func FormatString(number float64) string{
	data := fmt.Sprintf("%.2f",number)
	temp := strings.Split(data,".")
	main := temp[0]
	fraction := temp[1]
	var mainData string
	if len(main) < 3{
		return main + "." + fraction
	} else{
		for i := len(main) - 1; i>= 0; i--{
			temp := len(main) - i -1
			if temp % 3 == 0 && temp != 0{
				mainData = string(main[i]) + "," + mainData
			} else{
				mainData = string(main[i]) + mainData
			}
		}
		return mainData + "." + fraction
	}
}

https://play.golang.org/p/PbPUAyf1tY3