LinkedList implementation in C

linkedlist.c

#include<stdio.h>
#include<stdlib.h>

struct Node{
    int data;
    struct Node *next;
};

struct Node *NewNode(int data){
    struct Node *node = (struct Node*)malloc(sizeof(struct Node));
    node->data = data;
    node->next = NULL;
    return node;
};

struct Node *head = NULL;

void push(int data){
    struct Node *node;
    if(head==NULL){
        head = NewNode(data);
    }
    else{
        node = NewNode(data);
        node->next = head;
        head = node;
    }
}

void print()
{
    struct Node *temp = head;
    while(temp!=NULL){
        printf("%d ", temp->data);
        temp = temp->next;
    }
    printf("\n");
}

void reverse(){
    struct Node *prev, *temp, *next=NULL;
    prev = NULL;
    temp = head;
    while(temp!=NULL){    
        next = temp->next;
        temp->next = prev;
        prev = temp;
        temp = next;
    }
    if(prev!=NULL)
    head = prev;
}

int main()
{
    push(10);
    push(20);
    push(30);
    push(40);
    reverse();
    print();
}