poly LL(incomplete)

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

// Node structure for a term in a polynomial
struct Node {
    int coeff;  // Coefficient of the term
    int exp;    // Exponent of the term
    struct Node* next;  // Pointer to the next term
};

// Function to create a new node
struct Node* createNode(int coeff, int exp) {
    struct Node* newNode = (struct Node*)malloc(sizeof(struct Node));
    newNode->coeff = coeff;
    newNode->exp = exp;
    newNode->next = NULL;
    return newNode;
}

// Function to insert a term into a polynomial
void insertTerm(struct Node** poly, int coeff, int exp) {
    struct Node* newNode = createNode(coeff, exp);

    if (*poly == NULL) {
        *poly = newNode;
    } else {
        struct Node* last = *poly;
        while (last->next != NULL) {
            last = last->next;
        }
        last->next = newNode;
    }
}

// Function to add two polynomials
struct Node* addPolynomials(struct Node* poly1, struct Node* poly2) {
    struct Node* result = NULL;

    while (poly1 != NULL || poly2 != NULL) {
        int coeff1 = (poly1 != NULL) ? poly1->coeff : 0;
        int exp1 = (poly1 != NULL) ? poly1->exp : 0;

        int coeff2 = (poly2 != NULL) ? poly2->coeff : 0;
        int exp2 = (poly2 != NULL) ? poly2->exp : 0;

        int sumCoeff = coeff1 + coeff2;

        insertTerm(&result, sumCoeff, exp1);

        if (poly1 != NULL) {
            poly1 = poly1->next;
        }
        if (poly2 != NULL) {
            poly2 = poly2->next;
        }
    }

    return result;
}

// Function to display a polynomial
void displayPolynomial(struct Node* poly) {
    while (poly != NULL) {
        printf("%dx^%d", poly->coeff, poly->exp);

        if (poly->next != NULL) {
            printf(" + ");
        }

        poly = poly->next;
    }
    printf("\n");
}

// Main function
int main() {
    struct Node* poly1 = NULL;
    struct Node* poly2 = NULL;
    struct Node* result = NULL;

    // Insert terms into the first polynomial
    insertTerm(&poly1, 3, 2);
    insertTerm(&poly1, 4, 1);
    insertTerm(&poly1, 5, 0);

    // Insert terms into the second polynomial
    insertTerm(&poly2, 1, 3);
    insertTerm(&poly2, 2, 1);
    insertTerm(&poly2, 3, 0);

    // Display the first polynomial
    printf("Polynomial 1: ");
    displayPolynomial(poly1);

    // Display the second polynomial
    printf("Polynomial 2: ");
    displayPolynomial(poly2);

    // Add the polynomials
    result = addPolynomials(poly1, poly2);

    // Display the result
    printf("Sum: ");
    displayPolynomial(result);

    // Free allocated memory
    free(poly1);
    free(poly2);
    free(result);

    return 0;
}