Convert env-variable to example string
from: api-host.com
to: xxx-xxxx.xxx
npx env-to-example "https://string-to-convert.com"
npx env-to-example "us-east-1" // => "xx-xxxx-x"
npx env-to-example "http://google.com" // => "http://xxxxxx.xxx"
npx env-to-example "some-secret-key" // => "xxxx-xxxxxx-xxx"