make node class static

[sarthak0050]

DS-Algo/trees/Tree.java

Line 63 in 0f60cf2

class Node {

this exception is thrown by java compiler:
No enclosing instance of type Tree is accessible. Must qualify the allocation with an enclosing instance of type Tree (e.g. x.new A() where x is an instance of Tree).

[yoursmanjunad]

Hey, as far as I remember the concepts of OOPs, we are not allowed to use a constructor inside a class. With respect to that, in order to satisfy the OOPs concepts, we need to change our code entirely.