How to run a Go project with multiple files in the same main package?

Hi! I just started learning Go and ran into a problem. I have a small project consisting of several files, all located in the `cmd` folder and declared as `package main`. Here is the structure: ``` myproject/ cmd/ main.go helpers.go config.go ``` In `main.go` I call functions from `helpers.go`, for example: ```go // main.go package main func main() { msg := getMessage() fmt.Println(msg) } ``` ```go // helpers.go package main func getMessage() string { return "Hello from helpers!" } ``` When I try to run the project with the command `go run cmd/main.go`, I get an error: ``` # command-line-arguments ./main.go:6:14: undefined: getMessage ``` I understand that Go only sees one file. How do I properly run the project so that all files are included?