Add some notes to cat.c

src/cat.c

@@ -86,6 +86,7 @@ int main(int argc, char **argv)
 
 	if(!upresence and (2 * (strlen(buf) + strlen(newbuf)) >= buflen))
 	    {
+	    /* Rewrite this bit to use realloc and/or memcpy? */
 	    tmpbuf = malloc(2 * (strlen(buf) + strlen(newbuf)));
 	    strcpy(tmpbuf, buf);
 	    free(buf);