Write a program which returns list of all files having same content from the directory(including sub directory).
e.g from below directory structure, it returns list [[a/b/c/x.txt,a/e/k.log],[a/b/c/y.txt,a/b/d/z.png],[a/b/d/w.jpeg]].
e.g.
/a
/b
/c
x.txt
y.txt
/d
z.png
w.jpeg
/e
k.log
Note: file extension does not matter.