private static string ApplyTransformation(string textInput)
{
const string MAPPINGSTRING = "ABCDEF1234567890FEDCBAABCD";
char[] characterMap = MAPPINGSTRING.ToCharArray();
char[] inputArray = textInput.ToCharArray();
const string allowedCharacters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
char[] allowedCharacterArray = allowedCharacters.ToCharArray();
const string allowedNumerics = "0123456789";
string filteredCharacter = "";
StringBuilder filteredCharacters = new StringBuilder();
int charIndex = 0;
for (int c = 0; c < inputArray.Length; c++)
{
charIndex = allowedCharacters.IndexOf(inputArray[c].ToString().ToUpper());
if (charIndex > -1)
{
filteredCharacter = characterMap[charIndex % MAPPINGSTRING.Length].ToString();
filteredCharacters.Append(filteredCharacter);
}
else if (allowedNumerics.IndexOf(inputArray[c]) > -1)
{
filteredCharacters.Append(inputArray[c]);
}
}
return(filteredCharacters.ToString());
}
private static string ApplyTransformation(string textInput)
{
const string MAPPINGSTRING = "9XL2Z37AR4";
char[] characterMap = MAPPINGSTRING.ToCharArray();
char[] inputArray = textInput.ToCharArray();
StringBuilder sbTransfomation = new StringBuilder();
for (int c = 0; c < inputArray.Length; c++)
{
sbTransfomation.Append(characterMap[int.Parse(inputArray[c].ToString())].ToString());
}
return(sbTransfomation.ToString());
}
