utils(pkg)
   | auth.go (has a function names test1)
controllers(pkg)
   | login.go (has a function names test2)

import "../utils"

func test2(c *gin.Context) bool{
      utils.test1()
}

package utils

func Test1() string {
    return "Test1"
}

package controllers

import "project1/utils"

func Test2() string {
    return utils.Test1()
}

package main

import (
    "fmt"
    "project1/controllers"
)

func main() {
    fmt.Println(controllers.Test2())
}

Test1