fix #955

app/utils/string.py

@@ -656,3 +656,18 @@ class StringUtils:
             return True
         except ValueError:
             return False
+
+    @staticmethod
+    def find_common_prefix(str1: str, str2: str) -> str:
+        if not str1 or not str2:
+            return ''
+        common_prefix = []
+        min_len = min(len(str1), len(str2))
+
+        for i in range(min_len):
+            if str1[i] == str2[i]:
+                common_prefix.append(str1[i])
+            else:
+                break
+
+        return ''.join(common_prefix)