Challenge 1 — Solution

Task: Define a struct Book with fields Title (string), Pages (int).
Create one, then write a method (b Book) Describe() string that
returns a sentence combining both fields. Print the result of
calling Describe().

package main

import "fmt"

type Book struct {
	Title string
	Pages int
}

func (b Book) Describe() string {
	return fmt.Sprintf("%s has %d pages", b.Title, b.Pages)
}

func main() {
	book := Book{Title: "The Hobbit", Pages: 310}
	fmt.Println(book.Describe())
}


Expected output:

The Hobbit has 310 pages

Notes:
- fmt.Sprintf works exactly like Printf, except it returns the
  formatted string instead of printing it directly — needed here
  since Describe() must return a string, not print one itself.
- (b Book) is a plain (non-pointer) receiver, which is fine here
  since Describe() only reads fields, it never needs to change them.
- book.Describe() reads naturally, the same dot-call syntax used for
  any Go method, regardless of receiver type.