Initial QSfera import

Server/vendor/github.com/gookit/goutil/arrutil/arrutil.go

@@ -0,0 +1,18 @@
+// Package arrutil provides some util functions for array, slice
+package arrutil
+
+import (
+	"github.com/gookit/goutil/mathutil"
+)
+
+// GetRandomOne get random element from an array/slice
+func GetRandomOne[T any](arr []T) T { return RandomOne(arr) }
+
+// RandomOne get random element from an array/slice
+func RandomOne[T any](arr []T) T {
+	if ln := len(arr); ln > 0 {
+		i := mathutil.RandomInt(0, len(arr))
+		return arr[i]
+	}
+	panic("cannot get value from nil or empty slice")
+}