kotlin basics : Using Set in the code - devrath/KotlinAlchemy GitHub Wiki
             About Set
- This is a type of collection that holds only a unique collectionof items.
- Distinctions from other elements are what make it unique.
- We use set to storeandprocessthe elements.
- Processing the elements is done in a loop.
- We can check if the element exists in a set.
- If we want to add new elementorremove the elementfrom thesetonly if we usemutableSet(), This is similar to other collections.
private fun initiate() {
        var students = setOf("Mahesh","Suresh","Venkatesh","Mahesh")
        println(students)
        println(students.contains("Suresh"))
}