maatwebsite/excel file import

#include <stdio.h>
#include "xlsxio_read.h"

int main() {
    const char* filename = "example.xlsx";
    xlsxioreader reader = xlsxioread_open_file(filename);

    if (reader != NULL) {
        const char* sheetname = NULL;
        xlsxioreadersheet sheet = xlsxioread_sheet_open(reader, sheetname, XLSXIOREAD_SKIP_EMPTY_ROWS);

        if (sheet != NULL) {
            while (xlsxioread_sheet_next_row(sheet)) {
                size_t row = xlsxioread_sheet_row_number(sheet);
                printf("Row %zu:\n", row);

                size_t cols = xlsxioread_sheet_col_number(sheet);
                for (size_t col = 0; col < cols; col++) {
                    const char* value = xlsxioread_sheet_read_string(sheet, col, NULL);
                    printf("  Column %zu: %s\n", col, value);
                }
            }

            xlsxioread_sheet_close(sheet);
        } else {
            fprintf(stderr, "Failed to open sheet\n");
        }

        xlsxioread_close(reader);
    } else {
        fprintf(stderr, "Failed to open file\n");
    }

    return 0;
}