The csv file will have random name, can you show me how you will rename it without going into hassel of copying its name?

For example lets say name of root folder is Main, inside main i wrote csv using coalsce(1) and the structure is Main/data.csv/RandomBigName-part-00000xyz.csv

Now i want to move csv file inside Main folder and lets say name it as dummyData.csv... So final structure which i want is Main/dummyData.csv

Please help