(define-syntax my-let
  (syntax-rules ()
    ((_ ((name x) ...) ex1 ex2 ...)
     ((lambda (name ...) ex1 ex2 ...)
      x ...))))

(define-syntax my-let*
  (syntax-rules ()
    ((_ () ex1 ex2 ...)
     (my-let () ex1 ex2 ...))
    ((_ ((name1 x1) (name2 x2) ...)
       ex1 ex2 ...)
     (my-let ((name1 x1))
       (_ ((name2 x2) ...)
         ex1 ex2 ...)))))