- I've removed the WriteFile and put it into CopyFile.

- It still uses filesytem.Split but just to get the directory name to create it if it doesn't exist.

- It opens the file with os.OpenFile and set the file permissions there instead of after copying.

- It removes the file if io.Copy returns an error.

- It doesn't need error handling on toFile.Close as it only returns an error if it's called multiple times.

The only change is changing path.Split -> filepath.Split