// newname parent dir is a file
err = fs.Rename(
fmt.Sprintf("dir%d/dir%d/file%d", i, j, j),
fmt.Sprintf("dir%d/file%d/patherror", i, inner-j-1))
// newname parent dir is a file
err = fs.Rename(
fmt.Sprintf("dir%d/dir%d/file%d", i, j, j),
fmt.Sprintf("dir%d/file%d/patherror", i, inner-j-1))