Save a Secret key to sharedPreference

PrefUrls.kt

fun saveSecretKey(sharedPref: SharedPreferences, secretKey: SecretKey): String {
      val encodedKey = Base64.encodeToString(secretKey.encoded, Base64.NO_WRAP)
      sharedPref.edit().putString(AppConstants.secretKeyPref, encodedKey).apply()
      return encodedKey
}