C : Replace the spaces of a string with a specific character
Fastest method to remove all whitespace from Strings in .NET - CodeProject
C# string.IsNullOrEmpty, IsNullOrWhiteSpace - Dot Net Perls
Kotlin on Twitter: "New in Kotlin 1.3: The ifEmpty function can be used in a chained call to specify a fallback value for an empty collection, array, or string. The ifBlank function