How to concatenate and format strings using fmt in Go?

In Go, you can concatenate and format strings using the fmt package. Here's an example:

package main

import (
	"fmt"
)

func main() {
	name := "John"
	age := 25

	// Concatenate and format strings using fmt.Sprintf()
	result := fmt.Sprintf("My name is %s and I am %d years old.", name, age)
	fmt.Println(result)

	// Concatenate and format strings using fmt.Printf()
	fmt.Printf("My name is %s and I am %d years old.\n", name, age)

	// Concatenate and format strings using fmt.Println()
	fmt.Println("My name is", name, "and I am", age, "years old.")

	// Concatenate and format strings using fmt.Print()
	fmt.Print("My name is ", name, " and I am ", age, " years old.\n")
}

In the above example, the %s and %d are format verbs used for string and integer formatting, respectively. The fmt.Sprintf() function is used to concatenate and format strings, while fmt.Printf(), fmt.Println(), and fmt.Print() are used to print the strings to the console.

This will output:

My name is John and I am 25 years old.
My name is John and I am 25 years old.
My name is John and I am 25 years old.
My name is John and I am 25 years old.

You can also use other format verbs like %f for floating-point numbers, %t for booleans, %v for any value, etc.