I have my amazon interview coming up for SDE in seattle. One of my friends recently went on-site in Seattle and was asked this question in OOD. I have not been able to find a good approach to this question. Any suggestions would be helpful

implemnet linux find command as an api ,the api willl support finding files that has given size requirements and a file with a certain format like

1. find all file >5mb
2. find all xml
   Assume file class
   {
   get name()
   directorylistfile()
   getFile()
   create a library flexible that is flexible
   Design clases,interfaces.