ContainsI a case-insensitive strings contains.

CopyFile copies the contents of src to dst.

CurrentUserName returns the UserName of the current os user.

ExpandHomeDir expands the path to include the home directory if the path is prefixed with `~`.

FileExists check given filename if exists.

GetDeviceID get secret key from env, if not set returns machine id always returns 16 characters key.

HashWithSHA256 hashes the input string using SHA-256 and returns the hexadecimal representation of the hash.