Vá importar pacote personalizado

package main 

// import the custom package calculator
import (
  "fmt"
  "Packages/calculator"
)
func main() {
  number1 := 9
  number2 := 5
  // use the add function of calculator package
  fmt.Println(calculator.Add(number1, number2))
 // use the subtract function of calculator package
  fmt.Println(calculator.Subtract(number1, number2))

}
SAMER SAEID