Monorepo scaffolding (#16)

* Change scaffolding

* Fix gh action

noah/send.go

@@ -0,0 +1,60 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+
+	"github.com/ark-network/ark/common"
+	"github.com/urfave/cli/v2"
+)
+
+var (
+	receiversFlag = cli.StringFlag{
+		Name:     "receivers",
+		Usage:    "receivers of the send transaction, JSON encoded: '[{\"to\": \"<...>\", \"amount\": <...>}, ...]'",
+		Value:    "",
+		Required: true,
+	}
+)
+
+var sendCommand = cli.Command{
+	Name:   "send",
+	Usage:  "Send VTXOs to a list of addresses",
+	Action: sendAction,
+	Flags:  []cli.Flag{&receiversFlag},
+}
+
+func sendAction(ctx *cli.Context) error {
+	receivers := ctx.String("receivers")
+
+	// parse json encoded receivers
+	var receiversJSON []receiverJSON
+	if err := json.Unmarshal([]byte(receivers), &receiversJSON); err != nil {
+		return fmt.Errorf("invalid receivers: %s", err)
+	}
+
+	if len(receiversJSON) <= 0 {
+		return fmt.Errorf("no receivers specified")
+	}
+
+	for _, receiver := range receiversJSON {
+		// TODO: check if receiver asp public key is valid
+		_, _, _, err := common.DecodeAddress(receiver.To)
+		if err != nil {
+			return fmt.Errorf("invalid receiver address: %s", err)
+		}
+
+		if receiver.Amount <= 0 {
+			return fmt.Errorf("invalid amount: %d", receiver.Amount)
+		}
+	}
+
+	fmt.Println("send command is not implemented yet")
+
+	return nil
+}
+
+type receiverJSON struct {
+	To     string `json:"to"`
+	Amount int64  `json:"amount"`
+}