You have, as examples:
<a href="/showProductsMainCategoryWise?main_category=Women Fashion">
<a href="/showProductsCategoryWise?main_category=Women Fashion and category=Women Clothing">
These are not valid query variables in the url.
You must not have spaces within the href, they’re not going to get passed through to the server.
One of your options would be to URL-encode those variables, and then decode them on the server.