gistfile1.cpp

void remove_recursively(bt_node* top, int data){
  if(top->data == data){
    if(top->right == NULL && top->left == NULL){
      top->data = NULL;
    }else{
      if(top->data < data){
  remove_recursively(top->left, data);
      }else{
	remove_recursively(top->right, data);
      }
    }
  }
}

void remove(bt_node** top_ref, int data) {
  // implement me
  if(*top_ref == NULL){
    return;
  }else{
    if(*top_ref->data == data){
      if(*top_ref->left == NULL && *top_ref->right == NULL){
      *top_ref->data = NULL;
      }
    
    }else{
      remove_recursively(*top_ref, data);
    }
  }
}