Write a C program to create a copy of a tree

Here is a C program which does that...

mynode *copy(mynode *root)

{

  mynode *temp;

  

  if(root==NULL)return(NULL);

   

  temp = (mynode *) malloc(sizeof(mynode));

  temp->value = root->value;


  temp->left  = copy(root->left);

  temp->right = copy(root->right);

  return(temp);

}