Adding new element in linked list at the end.

 #include <stdio.h>

#include <stdlib.h>

struct Node {

    int data;

    struct Node* next;

};

void insertAtEnd(struct Node** head, int value) {

    struct Node* newNode = (struct Node*)malloc(sizeof(struct Node));

    newNode->data = value;

    newNode->next = NULL;

    if (*head == NULL) {

        *head = newNode;

        return;

    }

    struct Node* temp = *head;

    while (temp->next != NULL) {

        temp = temp->next;

    }

    temp->next = newNode;

}

void printList(struct Node* head) {

    while (head != NULL) {

        printf("%d -> ", head->data);

        head = head->next;

    }

    printf("NULL\n");

}

int main() {

    struct Node* head = NULL;

    insertAtEnd(&head, 10);

    insertAtEnd(&head, 20);

    insertAtEnd(&head, 30);

    printList(head);

    return 0;

}