group array

groupArray.go

func groupArray(array []int, length int) [][]int {
	var group [][]int
	if length > len(array) {
		return nil
	}
	for len(array) > length {
		var newArray []int
		newArray = append(newArray, array[:length]...)
		group = append(group, newArray)
		array = append(array[:0], array[length:]...)
	}
	group = append(group, array)
	return group
}