"(aaa) (bbb (ccc( ddd) eee)) (fff)" => "(aaa)" "(bbb (ccc( ddd) eee))" "(fff)"
"  (a) ((bc (d))  ef) h" => "(a)" "((bc (d))  ef)"
"(a)" => "(a)"
"(a) " => "(a)"
"(a)   (bc)" => "(a)" "(bc)"
"" =>