Help me in solving MATDIAGSUM problem

help
,
1

My issue

sum of diagonal

My code

#include <stdio.h>

int main() {
    int N;

    // Input the size of the matrix

    scanf("%d", &N);

    int matrix[N][N];
    int primaryDiagonalSum = 0;
    int secondaryDiagonalSum = 0;

    // Input elements of the matrix

    for (int i = 0; i < N; i++) {
        for (int j = 0; j < N; j++) {
            scanf("%d", &matrix[i][j]);
        }
    }

    // Calculate the sums of the primary and secondary diagonals
    for (int i = 0; i < N; i++) {
        primaryDiagonalSum += matrix[i][i];             // Primary diagonal
        secondaryDiagonalSum += matrix[i][N - 1 - i];   // Secondary diagonal
    }

    // Output the sums of the diagonals
   
    printf("%d\n", primaryDiagonalSum + secondaryDiagonalSum);

    return 0;
}

Learning course: BCS301: Data structures
Problem Link: https://www.codechef.com/learn/course/abesit-dsa/ABESITDS09/problems/MATDIAGSUM