Pass by reference

#1

if in insert function trie root is not passed by address or reference then how it has changes in main function

#2

@neerav

yes head is not pass by reference but changes reflect back to main

because we are passing addresses

function also copy the address of head->left and head->right
and change happens through these addresses so we can say that left and right is pass by reference as there address are passed
so changes will reflect to main

#3

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