TrimOrNullify

Convenience method for trimming, truncating and nullifying of string.

If string is empty or containing whitespace only, then the method returns null.
Otherwise the string is trimmed
If parameter maxLength is provided then the string will be shortened if necessary.

string value = ...;

var trimmedOrNull = value.TrimOrNullify();

var trimmedAndShortenedOrNull = value.TrimOrNullify(maxLength: 10);