Find the Ingredient that shares the longest prefix with path.

def find_best_match(path, prefixes):
    """Find the Ingredient that shares the longest prefix with path."""
    path_parts = path.split('.')
    for p in prefixes:
        if len(p) <= len(path_parts) and p == path_parts[:len(p)]:
            return '.'.join(p), '.'.join(path_parts[len(p):])
    return '', path