private string Translate(string inputString, TranlateDirection translateDirection)
{
int[] explandedNumericKey = SetLengthOfNumericKey(inputString, NumericKey);
int[] inputNumeric = GetIntsFromString(inputString);
int[] translatedNumeric = ApplyKey(inputNumeric, explandedNumericKey, translateDirection);
return(GetStringFromInts(translatedNumeric));
}
private int[] ApplyKey(int[] message, int[] key, TranlateDirection translateDirection)
{
int multiplier =
translateDirection == TranlateDirection.Encode
? 1
: -1;
return(Enumerable.Range(0, message.Length)
.Select(i => message[i] + (multiplier * key[i]))
.ToArray());
}