Here is the c code for the procedure.

#include

void revstr$()$

$\{$

int c$=$getchar$()$;

if $($c$==0)$

$\{$

printf$("$

$")$;

return;

$\}$

else

$\{$

printf$("\%$c$",$c$)$;

revstr$()$;

printf$("\%$c$",$c$)$;

return;

$\}$

$\}$

int main$()$

$\{$

printf$("$Please enter a string: $")$;

revstr$()$;

printf$("$

$")$;

return $0$;

$\}$

$```$