LivePhone.normalize-exclamation-mark

You're seeing just the function normalize-exclamation-mark, go back to LivePhone module for more information.

normalize!(phone, country)

normalize!(String.t(), String.t()) :: String.t()

This is used to normalize a given phone number to E.164 format, and immediately return the value whether it is formatted or not.

iex> LivePhone.normalize!("1234", nil)
"1234"

iex> LivePhone.normalize!("+1 (650) 253-0000", "US")
"+16502530000"