Linked List in C

linkedList.c

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

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

typedef struct Node node;

void addElement(node** start, int data){
    node* newNode = (node*)malloc(sizeof(node));

    newNode->data = data;
    newNode->next = NULL;

    if (*start == NULL){
        *start = newNode;
    }else {
        node* current = *start;
        while(current->next !=NULL){
        current = current->next;
    }

    current->next = newNode;
    
    }
}

void showElements(node* start){
   node* current = start;

    while (current != NULL) {
        printf("%d -> ", current->data);
        current = current->next;
    }
    printf("NULL\n");
}

int main(){
    node* list = NULL;
    addElement(&list, 5);
    addElement(&list, 7);
    addElement(&list, 10);
    showElements(list);

    return 0;
}