How to pass a pointer to a structure to a function of another package?

Question

go

Hello! Faced such a problem, it is impossible to pass a pointer to a structure to a function from another package.
Own code example:

package main
import "Project01/tools"
type TestTest struct {
    Str1,Str2,Str3 string
}
func main() {
    var par1 TestTest
    tools.Foo(&par1)
}

And the tools package

package tools
import "fmt"
func Foo(par *TestTest) { // <- Тут ругается, пишет не знаю такой структуры TestTest
    fmt.Println(par)
}

Tell me what's the catch? How to fix?

Answer 1

Your tools doesn't know anything about TestTest from main.
It makes more sense to declare it in tools. Or use interface{}

Answer 2

Import package?
PS People, stop writing in notepads, there are normal IDEs, and there are hundreds of them. 99% of them will not allow this and import the package automatically. This is the most elementary thing, but what will happen next?