title: Deleting subdirectories and files in a given directory
body: <p>I want to delete all subdirectories and files from a directory, but not the directory itself. For examnple, if I pass "Sample" directory in a variable, and "Sample" directory contains three subdirectories and 3 files, I want to delete all that 3 directories and 3 files. In practice, the "Sample" directory can contain many subdirectories and files.</p>