more simplify structure

hello/hello.go

@@ -0,0 +1,22 @@
+package hello
+
+// User user type
+type User struct {
+	ID   int64
+	Name string
+	Addr *Address
+}
+
+// Address address type
+type Address struct {
+	City   string
+	ZIP    int
+	LatLng [2]float64
+}
+
+var alex = User{}
+
+// Hello writes a welcome string
+func Hello() string {
+	return "Hello, " + alex.Name
+}