Can you explain the mechanism of package functioning in the system?

In Go, packages are a way to organize and group code. Each package is a set of related source files that are compiled together and have a unique name.

Packages allow:

• To divide code into logical parts
• To reuse code in different places
• To control scope (export only necessary functions, types, and variables)

A Go file begins with a package declaration, for example:

package mathutils

To use functions from another package, it is imported:

import "fmt"

Exported elements start with an uppercase letter, for example, the Println function from the fmt package.

Thus, packages in Go help structure the program and manage dependencies between its parts.