first working version

this version search for

• os.TempDir
• os.MkdirTemp
• ioutil.TempDir

on golang test and suggests to use the equivalent TempDir() from testing package, like https://pkg.go.dev/testing#T.TempDir

TempDir returns a temporary directory for the test to use. The directory is automatically removed when the test and all its subtests complete. Each subsequent call to t.TempDir returns a unique directory; if the directory creation fails, TempDir terminates the test by calling Fatal.

this is much more robust and we don't need to care about remove things after the test