wp-admin page redirecting to wrong URL

Hello folks,
I don’t know whether this is a codex question or beyond codex. I need experts’ help.
I have been working on developing a blog at https://newshandle.com/ and I used plugin called ‘Search and Replace’ for some database edits. What happened was: I ended replacing ‘//’ with ‘/’ (double slash replaced by single slash). From that moment my site is broken and I can’t access “wp-admin”. To be precise, once I enter “https://newshandle.com/wp-admin/”, I get redirected to “https://newshandle.com/newshandle.com/wp-login.php?redirect_to=http%3A%2F%2Fnewshandle.com%2Fwp-admin%2F&reauth=1” and that is, obviously a 404 page.
I have no idea how to undo the wrong step that I performed on database.
Please help.
Thank you in advance.