If any undergraduate/postgraduate student stumbles on some problem and generalise it. How can he know that the same work has been done earlier or not? Is there any online platform (website/forum) available for it?
To the best of my knowledge, there is no platform available which will do this task for you. The best practice to check whether the research is genuine/authentic is exploring the google scholar with the keywords of your research. Set the time boundary so that you can learn about the latest contribution in that domain. Initially, it takes time. But, eventually, it will help you developing profound insight into your research.