how to change file name to folder name

Hi Guys

  I have a folder constructed as below

  c:\folder\userA;

  c:\folder\userB;

  c:\folder\userC;

  and so on, and in each usrX foler, there was local.csv file , so now what i want was to change the local.csv in each folder to the usera.csv , userB.csv and so on , can powershell do this ?