Improvement on Problem004 Common Lisp solution for CLISP
Improvement on Problem004 Common Lisp solution for CLISP

Avoiding calling the tail-call recursive reverse-digits on
CLISP we get a better performance on executing this algorithm. For
SBCL this didn't take much effect.

SBCL: 0.304 s
CLISP: 3.778 s

Probably CLISP don't implement Tail Call Optimization.

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