package api import "errors" func dbGetUser(id int64) (*User, error) { for _, u := range users { if u.ID == id { return u, nil } } return nil, errors.New("User not found") } func dbGetMessage(id string) (*Message, error) { for _, a := range messages { if a.ID == id { return a, nil } } return nil, errors.New("Message not found") }