diff --git a/server/entertainment_decider/common.py b/server/entertainment_decider/common.py
index e6028f3..a3614c9 100644
--- a/server/entertainment_decider/common.py
+++ b/server/entertainment_decider/common.py
@@ -1,36 +1,5 @@
-import sys
 from typing import (
     Optional,
     Sequence,
     TypeVar,
 )
-
-
-# source: https://peps.python.org/pep-0257/#handling-docstring-indentation
-def trim(docstring: str) -> str:
-    """
-    Trim strings like docstrings are trimmed following PEP 257
-    """
-    if not docstring:
-        return ""
-    # Convert tabs to spaces (following the normal Python rules)
-    # and split into a list of lines:
-    lines = docstring.expandtabs().splitlines()
-    # Determine minimum indentation (first line doesn't count):
-    indent = sys.maxsize
-    for line in lines[1:]:
-        stripped = line.lstrip()
-        if stripped:
-            indent = min(indent, len(line) - len(stripped))
-    # Remove indentation (first line is special):
-    trimmed = [lines[0].strip()]
-    if indent < sys.maxsize:
-        for line in lines[1:]:
-            trimmed.append(line[indent:].rstrip())
-    # Strip off trailing and leading blank lines:
-    while trimmed and not trimmed[-1]:
-        trimmed.pop()
-    while trimmed and not trimmed[0]:
-        trimmed.pop(0)
-    # Return a single string:
-    return "\n".join(trimmed)
diff --git a/server/entertainment_decider/common/__init__.py b/server/entertainment_decider/common/__init__.py
index b5f8668..0699a53 100644
--- a/server/entertainment_decider/common/__init__.py
+++ b/server/entertainment_decider/common/__init__.py
@@ -11,6 +11,9 @@ from ._itertools import (
 from ._setting_handler import (
     update_bool_value,
 )
+from ._string import (
+    trim,
+)
 from ._subprocess import (
     call,
 )
@@ -24,5 +27,6 @@ __all__ = [
     "iter_lookahead",
     "limit_iter",
     "to_just_number",
+    "trim",
     "update_bool_value",
 ]
diff --git a/server/entertainment_decider/common/_string.py b/server/entertainment_decider/common/_string.py
new file mode 100644
index 0000000..ab78f0c
--- /dev/null
+++ b/server/entertainment_decider/common/_string.py
@@ -0,0 +1,31 @@
+import sys
+
+
+# source: https://peps.python.org/pep-0257/#handling-docstring-indentation
+def trim(docstring: str) -> str:
+    """
+    Trim strings like docstrings are trimmed following PEP 257
+    """
+    if not docstring:
+        return ""
+    # Convert tabs to spaces (following the normal Python rules)
+    # and split into a list of lines:
+    lines = docstring.expandtabs().splitlines()
+    # Determine minimum indentation (first line doesn't count):
+    indent = sys.maxsize
+    for line in lines[1:]:
+        stripped = line.lstrip()
+        if stripped:
+            indent = min(indent, len(line) - len(stripped))
+    # Remove indentation (first line is special):
+    trimmed = [lines[0].strip()]
+    if indent < sys.maxsize:
+        for line in lines[1:]:
+            trimmed.append(line[indent:].rstrip())
+    # Strip off trailing and leading blank lines:
+    while trimmed and not trimmed[-1]:
+        trimmed.pop()
+    while trimmed and not trimmed[0]:
+        trimmed.pop(0)
+    # Return a single string:
+    return "\n".join(trimmed)