returns the extension of the filename , or null if there is no extension concode_field_sep PlaceHolder placeHolder concode_field_sep void copyFile concode_elem_sep File findDir concode_elem_sep void deleteDirContents
String function ( String arg0 ) { try { return arg0 . substring ( arg0 . lastIndexOf ( '.' ) + 1 ) ; } catch ( Exception loc0 ) { return null ; } }