group.go

/*
 * Ali Ahmadi
 * Dedicated to MHM
 */

package num2text

import (
	"slices"
)

// group number to group of 3 digits
// func group(num string) []string {
// 	g := make([]string, 0)
// 	chs := strings.Split(num, "")

// 	str := ""
// 	c := 0

// 	for i := len(chs) - 1; i >= 0; i-- {
// 		if c == 3 {
// 			c = 1
// 			g = append(g, reverse(str))
// 			str = ""
// 			str += chs[i]
// 		} else {
// 			c++
// 			str += chs[i]
// 		}
// 	}

// 	if str != "" {
// 		g = append(g, reverse(str))
// 	}
// 	slices.Reverse(g)

// 	return g
// }

func group(num string) []string {
	groups := []string{}

	for len(num) > 2 {
		gr := num[len(num)-3:]
		groups = append(groups, gr)
		num = num[:len(num)-3]
	}

	if num != "" {
		groups = append(groups, num)
	}

	slices.Reverse(groups)
	return groups
}