nested class in Kotlin

A class is declared within another class then it is called a nested class. By default nested class is static so we can access the nested class property or variables using dot(.) notation without creating an object of the class.
```
class A {
    var sa = "Outer class"
    class B {
        var sb = "Nested class"
        fun f(str: String): String {
            var s = sb.plus(str)
            return s
        }
    }
}
fun main(args: Array<String>) {
    val b = A.B()
    var result = b.f(" member function call successful")
    println(result)
}
```
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