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From: Emanuel Berg <moasen@zoho.com>
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Subject: number-to-string-pad
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Did anyone do

(defun number-to-string-pad (number len)
  (let*((num-str     (number-to-string number))
        (len-num-str (length num-str))
        (pad-len     (- len len-num-str)) )
    (if (< 0 pad-len)
      (let ((pad-prefix (make-string pad-len ?0)))
        (concat pad-prefix num-str))
      num-str) ))

?

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