An error occurs during the implementation of the linked list tree

Question

enter code here

#include <stdio.h>
#include <stdlib.h>
typedef struct _node {
   int data;
   struct _node* rightChild;
   struct _node* leftChild;
}Node;


Node* create(int data) { // create node function
   Node* node = (Node*)malloc(sizeof(node));
   node->rightChild = NULL;
   node->leftChild = NULL; 
   node->data = data;
   return node;
}

void Inorder(Node* ptr) { // travel
   if (ptr) 
   {
       printf("%c ", ptr->data);
       Inorder(ptr->leftChild);
       Inorder(ptr->rightChild); 
   }
 }
int main(void)
{
   Node* node[300];
   for (int i = 1; i < 300; i++) {
       if (i == 1) {
           node[i] = create(i);
       }
       else {
           if (i % 2 == 0) {
               node[i / 2]->leftChild = create(i);
           }
           else {
               node[i / 2]->rightChild = create(i);
           }
       }
   }
    Inorder(node[10]);
}

I would like to implement a binary tree using a Node* array, rather than taking variables input one by one. But I keep getting errors in that area. Thanks for the advice.Which part do I need to modify to make that part implemented through a for statement? As far as I understand, both the left and right parts of the node array have passed values, so why am I getting an error?