add group color, owner manipulation

convertions.go

@@ -1,8 +1,28 @@
 package main
 
-import "strconv"
+import (
+	"fmt"
+	"strconv"
+	"strings"
+)
 
 func ConvertStringUint32(s string) (uint32, error) {
 	v, err := strconv.ParseUint(s, 10, 32)
 	return uint32(v), err
 }
+
+func ConvertStringToRgb(str string) ([3]uint8, error) {
+	parts := strings.SplitN(str, ",", 4)
+	if len(parts) != 3 {
+		return [3]uint8{}, fmt.Errorf("invalid rgb")
+	}
+	var rgb [3]uint8
+	for i, p := range parts {
+		n, err := strconv.ParseUint(strings.TrimSpace(p), 10, 8)
+		if err != nil {
+			return [3]uint8{}, fmt.Errorf("invalid component %d: %w", i, err)
+		}
+		rgb[i] = uint8(n)
+	}
+	return rgb, nil
+}