Reverse string

#include<stdio.h>

char* reverse(char[]);

int main()
{

    char str[100],*rev;

    printf("Enter  any string: ");
    scanf("%s",str);

    rev = reverse(str);

    printf("Reversed string is: %s",rev);
}

char* reverse(char str[])
{

    static int i=0;
    static char rev[100];

    if(*str)
 {
         reverse(str+1);
         rev[i++] = *str;
    }

    return rev;
}