my output cant display

#include <iostream.h>
#include <bits/stdc++.h>

using namespace std;
      
	  
	   struct Node
	   {
	       int data;
		   struct Node* next;
		   };
		   
		   
		   int small(struct Node* head)
		   {
		   
		   int min = INT_MAX;
		   
		   
		   while (head != NULL)
		   {
		   
		      if ( min > head->data)
			       min = head->data;
				   
				   head = head->next;
				   }
				   return min;
				   }
				   
				   
				   
				   void push (struct Node ** head ,int data)
				   {
				   	struct Node * newNode ;
					
					newNode->data=data;
					
					newNode->next = (*head);
					(*head) = newNode;
					}
					
				   
				   void display(struct Node* head)
				   {
				    while ( head != NULL ) 
					{
					   printf("%d -> ", head->data);
                          head = head->next;
					
					}
					cout << "NULL" << endl;
					}
				   
			int main()
			{
			   int x;
			  struct Node* head = NULL;
			  
			  
			   push(&head,5);
			   push(&head,10);
			   push(&head,19);
			   
			   cout << "Linked list is:"<<endl;
			   
			   display(head);
			   cout <<"The minimum element in linked list :"<<endl;
			   cout << small(head) <<endl;
			   
			   
			   return 0;
			   }

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