C program to get text between 2 substrings of the main string

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


int get_string_between_two_substrings(const char *str)
{

    const char *PATTERN1 = "LOCATION: ";
    const char *PATTERN2 = ".xml";

    char target[100];
    char *start, *end;

    memset(target, '\0', sizeof(target));

    /* start would point to the beginning of the substring in the main string.  */
    if ( start = strstr( str, PATTERN1 ) )
    {
    /* move the start pointer to string length(PATTERN) times ahead.
         * Now, start points to the beginning of the text be searched.
         */
        start += strlen( PATTERN1 );
 
        /* Now, search for pattern 2. end points to the beginning of PATTERN2  */
        if ( end = strstr( start, PATTERN2 ) )
        {
        /* Now, copy the text between PATTERN1 and PATTERN2 */  
            memcpy( target, start, end - start );
            target[end - start] = '\0';
        }
    }

    if ( target ) printf( "%s\n", target );

    return 0;
}


void main(void)
{

    const char *s = "LOCATION: http://192.168.1.197:8008/ssdp/device-desc.xml";

    get_string_between_two_substrings(s);

    return;          
}