my directory set up is like below

    .
├── go.mod
├── main.go
└── urlshort
    └── urlshort.go

go.mod

module fromscratch_urlshort

go 1.22.3

root dir name is fromscratch_urlshort, I did
go mod init fromscratch_urlshort

top of urlshort.go is

package urlshort

in main.go

I do

import(
  "urlshort"
)

when I run code I got error saying
go run main.go main.go:6:2: package urlshort is not in std (/usr/local/go/src/urlshort)

What am I doing wrong here ? My objective is to import the local module urlshort in main.go

P.S. what is a good way to set up go module when pulling a go project from a repo say github ? would the pulled directory work with go mod init ? what needs to be done ?