HPCC-32639 Use function to append path part ensuring separator

Adjust code in two places to use an inline function that ensures one
path separator between path parts when appending.

Signed-off-by: Terrence Asselin <terrence.asselin@lexisnexisrisk.com>

dali/base/dadfs.cpp

@@ -118,6 +118,16 @@ inline unsigned groupDistance(IGroup *grp1,IGroup *grp2)
     return grp1->distance(grp2);
 }
 
+inline StringBuffer &appendEnsurePathSepChar(StringBuffer &dest, StringBuffer &newPart, char psc)
+{
+    addPathSepChar(dest, psc);
+    if (isPathSepChar(newPart.charAt(0)))
+        dest.append(newPart.str()+1);
+    else
+        dest.append(newPart);
+    return dest;
+}
+
 
 static StringBuffer &normalizeFormat(StringBuffer &in)
 {
@@ -4474,12 +4484,8 @@ protected: friend class CDistributedFilePart;
         if (isPathSepChar(newPath.charAt(newPath.length()-1)))
             newPath.setLength(newPath.length()-1);
         newPath.remove(0, myBase.length());
-        // Ensure one path separator between baseDir and newPath
-        newdir.append(addPathSepChar(baseDir, psc));
-        if (isPathSepChar(newPath.charAt(0)))
-            newdir.append(newPath.str()+1);
-        else
-            newdir.append(newPath);
+        newdir.append(baseDir);
+        appendEnsurePathSepChar(newdir, newPath, psc);
         StringBuffer fullname;
         CIArrayOf<CIStringArray> newNames;
         unsigned i;
@@ -4498,7 +4504,8 @@ protected: friend class CDistributedFilePart;
 
                 StringBuffer copyDir(baseDir);
                 adjustClusterDir(i, copy, copyDir);
-                fullname.clear().append(copyDir).append(newPath);
+                fullname.clear().append(copyDir);
+                appendEnsurePathSepChar(fullname, newPath, psc);
                 newNames.item(i).append(fullname);
             }
         }