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

char    *extension(char *file)
{
    char   *s;

    for(s = file + strlen(file); s >= file; s--) {
	if(*s == '\\') {
	    return NULL;
	} else if(*s == '.') {
	    return s + 1;
	}
    }
    
    return 0;
}

#ifdef TEST

int	main(void)
{
    char f[] = "lfjsalfjslfjd.c";
    char f2[] = "dkfjdk\fsdfsd";
    char f3[] = "b:dir.c";
    
    printf("%s\n", extension(f));
    printf("%s\n", extension(f2));
    printf("%s\n", extension(f3));
    
    return 0;
}

#endif