<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def build_next_url(self, url):
 """Builds next url in a format compatible with cousteau. Path + query"""

        if not url:
            if self.split_urls:  # If we had a long request give the next part
                self.total_count_flag = False  # Reset flag for count
                return self.split_urls.pop(0)
            else:
                return None

        parsed_url = urlparse(url)
        return "{0}?{1}".format(parsed_url.path, parsed_url.query)