ex 4-13 (c the programming language 2 ed) reverse recursion

Rreverse.c

#include <stdio.h>
#include <string.h>

void reverse (char str[])
{
    static char temp[100];

    static int i = 1;

    static int first = 0;
    static int last;

    last = strlen (str) - i;

    temp[first++] = str[last];
    ++i;

    if (last <= 0)  {
        temp[first] = '\0';
        strcpy (str, temp);
        return;
    }

    reverse (str);

}

int main ()
{
    char str []  = {'h', 'e', 'l', 'l', 'o', '\0'};

    reverse (str);

    printf ("%s ", str);

    return 0;
}