remove default language local from url

what is best practice for remove default language local from url like this:

Code:

    domain.com/article/hello  <--- for default language example : en

    domain.com/fr/article/hello  <--- for french language example : fr

    domain.com/tr/article/hello  <--- for turkey language example : tr

    domain.com/jp/article/hello  <--- for japan language example : jp