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course/4-structs/exercises/2-nested_structs/readme.md

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+# Nested structs in Go
+
+Structs can be nested to represent more complex entities:
+
+```go
+type car struct {
+  Make string
+  Model string
+  Height int
+  Width int
+  FrontWheel Wheel
+  BackWheel Wheel
+}
+
+type Wheel struct {
+  Radius int
+  Material string
+}
+```
+
+The fields of a struct can be accessed using the dot `.` operator.
+
+```go
+myCar := car{}
+myCar.FrontWheel.Radius = 5
+```
+
+## Assignment
+
+Textio has a bug, we've been sending texts with information missing! Before we send text messages in Textio, we should check to make sure the required fields have non-zero values.
+
+Notice that the `user` struct is a nested struct within the `messageToSend` struct. Both `sender` and `recipient` are `user` struct types.
+
+Complete the `canSendMessage` function. It should return `true` only if the `sender` and `recipient` fields each contain a `name` and a `number`. If any of the default zero values are present, return `false` instead.