Explain the use of Go's struct fields for data encapsulation and organization?

In Go, a **struct** is a composite data type that allows you to group together related data fields under a single type. Struct fields can be used for data encapsulation and organization, allowing you to group related data fields together and enforce access restrictions on them.

Data encapsulation refers to the practice of hiding the implementation details of a data structure from the outside world and exposing only the necessary information through a public interface. In Go, this can be achieved by defining struct fields with different levels of visibility using the **public** and **private** access modifiers.

For example, let's say you have a **Person** struct that represents a person's name, age, and address. You can use public fields to expose the person's name and age, and private fields to hide their address:

type Person struct {
    Name string // public field
    age  int    // private field
    addr string // private field
}

In this example, the **Name** field is a public field that can be accessed by code outside of the **Person** struct, while the **age** and **addr** fields are private fields that can only be accessed by methods defined within the **Person** struct.

Struct fields can also be used for organizing related data fields into groups. For example, you could define a **ContactInfo** struct to group together a person's phone number and email address:

type ContactInfo struct {
    Phone   string
    Email   string
}

type Person struct {
    Name    string
    Age     int
    Contact ContactInfo
}

In this example, the **ContactInfo** struct is used to group together a person's phone number and email address, and the **Person** struct includes a **Contact** field that holds a **ContactInfo** value.

By using struct fields for data encapsulation and organization, you can create more modular and maintainable code that is easier to reason about and less prone to errors.