add route combination

src/dopt_basics/io.py

@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import pickle
+import re
 import shutil
 from collections.abc import Sequence
 from pathlib import Path
@@ -95,6 +96,16 @@ def prepare_path(
     return (pth_parent / filename).with_suffix(suffix)
 
 
+def _strip_url_components(string: str) -> str:
+    return re.sub(r"^[ /]+|[ /]+$", "", string)
+
+
+def combine_route(base_url: str, route: str) -> str:
+    base_url = _strip_url_components(base_url)
+    route = _strip_url_components(route)
+    return "/".join((base_url, route))
+
+
 def search_cwd(
     glob_pattern: str,
 ) -> Path | None: