Bogus directories created if absolute path passed

[inexorabletash]

Repro:

1. mkdir /tmp/foo
2. cadius EXTRACTFILE example.2mg "/VOL/FILE" /tmp/foo

Expected:

• File is extracted to /tmp/foo

Actual:

• File is extracted to /tmp/foo but empty directories tmp and tmp/foo are created in the current directory.

Root cause:

• In Src/os/os.c, os_CreateDirectory() is called with "/tmp/foo". It then tokenizes it into "tmp" and "foo" and recursively creates those directories inside the current working directory.