add divisor summatory function

cmd/sum.go

@@ -0,0 +1,42 @@
+/*
+Copyright © 2025 filifa
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+package cmd
+
+import (
+	"github.com/spf13/cobra"
+)
+
+// sumCmd represents the sum command
+var sumCmd = &cobra.Command{
+	Use:   "sum",
+	Short: "Compute summatory functions",
+	Long:  `Compute summatory functions.`,
+}
+
+func init() {
+	rootCmd.AddCommand(sumCmd)
+
+	// Here you will define your flags and configuration settings.
+
+	// Cobra supports Persistent Flags which will work for this command
+	// and all subcommands, e.g.:
+	// sumCmd.PersistentFlags().String("foo", "", "A help for foo")
+
+	// Cobra supports local flags which will only run when this command
+	// is called directly, e.g.:
+	// sumCmd.Flags().BoolP("toggle", "t", false, "Help message for toggle")
+}