const MinPassLength = 8
MinPassLength is the minimum acceptable password length
GetConfirmation will request user give the confirmation from stdin. "y", "Y", "yes", "YES", and "Yes" all count as confirmations. If the input is not recognized, it returns false and a nil error.
GetPassword will prompt for a password one-time (to sign a tx) It enforces the password length
GetString simply returns the trimmed string output of a given reader.