diff --git a/src/cstrings.i b/src/cstrings.i
index 1e94204..f786657 100644
--- a/src/cstrings.i
+++ b/src/cstrings.i
@@ -1,7 +1,7 @@
 (****************************************************************************
  * File name:       CSTRINGS.I
  * Created On:      Sat 03 Oct 2020 03:18:19 PM CEST
- * Last Modified:   Sat 03 Oct 2020 03:18:19 PM CEST
+ * Last Modified:   Sun 04 Oct 2020 04:34:02 PM CEST
  * Author:          Jali <jali@orca-central.de>
  ****************************************************************************
  * Implementation for handling C-Like strings                          
@@ -9,6 +9,8 @@
 
 IMPLEMENTATION MODULE CStrings;
 
+FROM Storage IMPORT ALLOCATE;
+
 PROCEDURE Compare(strA : CString, strB : CString) : CompareResult
 (* $L- *)
 BEGIN
@@ -34,16 +36,34 @@ BEGIN
 (* $L+ *)    
 END Compare;
 
+PROCEDURE CopyMem(tgt, src : CString)
+    p   : POINTER TO CHAR;
+BEGIN
+    p := tgt;
+    WHILE src^ <> NULL DO
+        p^ := src^;
+        p += 1;
+        src += 1;
+    END;
+END CopyStr;
+
 PROCEDURE Concat(strA, strB : CString) : CString 
     VAR
+        r   : POINTER TO CHAR;
         len : LONGCARD;
-        newString : ARRAY
-        resultString : POINTER TO CHAR;
 BEGIN
     len := Length(strA) + Length(strB);
-    
+    ALLOCATE(r, lenA + lenB);
+    CopyMem(r, strA);
+    CopyMem(r, strB);
+    (r + len)^ := NULL;
 END Concat;
 
+PROCEDURE Contains
+    
+BEGIN
+END Contains;
+
 END CStrings;
 
 (* vim: set filetype=modula2: *)