diff --git a/DTLib/DTLib.csproj b/DTLib/DTLib.csproj
index 22fa3ba..e346cd4 100644
--- a/DTLib/DTLib.csproj
+++ b/DTLib/DTLib.csproj
@@ -2,7 +2,7 @@
 	<PropertyGroup>
 		<!--package info-->
 		<PackageId>DTLib</PackageId>
-		<Version>1.6.4</Version>
+		<Version>1.6.5</Version>
 		<Authors>Timerix</Authors>
 		<Description>Library for all my C# projects</Description>
 		<RepositoryType>GIT</RepositoryType>
diff --git a/DTLib/Filesystem/IOPath.cs b/DTLib/Filesystem/IOPath.cs
index 15ebf35..5523223 100644
--- a/DTLib/Filesystem/IOPath.cs
+++ b/DTLib/Filesystem/IOPath.cs
@@ -15,29 +15,40 @@ public readonly struct IOPath
     
     public IOPath(char[] path, bool separatorsFixed=false)
     {
+        if (path.Length == 0)
+            throw new Exception("path is null or empty");
         Str = separatorsFixed ? new string(path) : FixSeparators(path);
     }
     
-    public IOPath(string path, bool separatorsFixed=false)
+    public IOPath(string path, bool separatorsFixed=false) : this(path.ToCharArray(), separatorsFixed)
     {
-        if (path.IsNullOrEmpty())
-            throw new Exception("path is null or empty");
-        Str = separatorsFixed ? path : FixSeparators(path.ToCharArray());
     }
 
     static string FixSeparators(char[] path)
     {
         int length = path.Length;
-        if (path[length-1] == Path.Sep || path[length-1] == Path.NotSep)
+        char lastChar = path[path.Length - 1];
+        if (lastChar == Path.Sep || lastChar == Path.NotSep)
             length--; // removing trailing sep
-        char[] fixed_path = new char[length];
+        StringBuilder sb = new StringBuilder();
+        bool prevWasSeparator = false;
         for (int i = 0; i < length; i++)
         {
             if (path[i] == Path.NotSep)
-                fixed_path[i] = Path.Sep;
-            else fixed_path[i] = path[i];
+            {
+                // prevent double separators like this "a//b"
+                if(!prevWasSeparator)
+                    sb.Append(Path.Sep);
+                prevWasSeparator = true;
+            }
+            else
+            {
+                sb.Append(path[i]);
+                prevWasSeparator = false;
+            }
         }
-        return new string(fixed_path);
+        
+        return sb.ToString();
     }
 
     public static IOPath[] ArrayCast(string[] a, bool separatorsFixed=false)
diff --git a/DTLib/Filesystem/Path.cs b/DTLib/Filesystem/Path.cs
index e91004d..4d71aac 100644
--- a/DTLib/Filesystem/Path.cs
+++ b/DTLib/Filesystem/Path.cs
@@ -96,10 +96,13 @@ public static class Path
     /// returns just dir name or file name with extension
     public static IOPath LastName(this IOPath path)
     {
+        if(path.Length < 2)
+            return path;
         int i = path.LastIndexOf(Sep);
         if (i == path.Length - 1) // ends with separator
             i = path.LastIndexOf(Sep, i - 1);
-        if (i == -1) return path;
+        if (i == -1) 
+            return path;
         return path.Substring(i + 1);
     }