C program to create mirror copy of a tree

Question:Write a C program to create a mirror copy of a tree left nodes become right and right nodes become left)

Solution:

#include<stdio.h>
struct binarysearchtree{
       int data;
       struct binarysearchtree* left;
       struct binarysearchtree* right;
};
typedef struct binarysearchtree* tree;

tree mirror_copy(tree T)
{
 if(T==NULL)
 return T;
 else
 {
    tree temp1=mirror_copy(T->left);
    tree temp2=mirror_copy(T->right);
    T->left=temp2;
    T->right=temp1;
    return T;
 }
}

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