diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6691e1a..90577e6 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -25,6 +25,7 @@ set(SOURCE
 	ml.cpp
 	ml_io.cpp
 	ml_date.cpp
+	ml_string.cpp
 	clib/csvparser.cpp
 	clib/sslclient.cpp
 	clib/json11.cpp ml_date.h ml_date.cpp)
@@ -32,3 +33,7 @@ set(SOURCE
 add_executable(${PROJECT_NAME} ${SOURCE})
 
 target_link_libraries(${PROJECT_NAME} stdc++ m ssl crypto)
+
+INSTALL(TARGETS ml
+		CONFIGURATIONS Release
+		DESTINATION /usr/local/bin/)
diff --git a/Readme.md b/Readme.md
index 3eb1ec3..e688eaf 100644
--- a/Readme.md
+++ b/Readme.md
@@ -1,11 +1,12 @@
 
 ### TODO
-- date support
-  - decode-universal-time
-- logical operators  
+- print-table
+- download 1 year of data from api.nasdaq.com into test dir
+- support for including lisp libs at startup from dir
 - documentation
+- rename data.csv and add more tickers
+- logical operators  
 - add url of source/inspiration to clib/*.cpp
-- support for including lisp libs
 - add stdtest - to test every functionality 
 - rename ivaluize
 - add benchmark
@@ -23,13 +24,14 @@
 - string functions
     - name it here
 - regexp functions    
+- date support
+  - decode-universal-time
+- anv function  
 - add hash datatype
 - add support for nil
 - conversion functions like parse-integer
 - list function nth
 - in test.lisp some explaining prints
-- rename data.csv and add more tickers
-
 
 #### Performance
 - push_back - repeatedly without reserving size
@@ -43,6 +45,7 @@ time ./build/ml -c '(include "../example.lisp") (print (fact 1000))'
 ```
 
 ### Links
+https://hyperpolyglot.org/lisp
 https://www.tutorialspoint.com/lisp/index.htm
 https://github.com/adam-mcdaniel/wisp
 
@@ -61,4 +64,9 @@ https://stackoverflow.com/questions/25896916/parse-http-headers-in-c
 
 
 #### read stdout and stderr from popen
-https://stackoverflow.com/questions/478898/how-do-i-execute-a-command-and-get-the-output-of-the-command-within-c-using-po
\ No newline at end of file
+https://stackoverflow.com/questions/478898/how-do-i-execute-a-command-and-get-the-output-of-the-command-within-c-using-po
+
+#### VPS providers
+https://www.skysilk.com/cloud/pricing/#classId=Standard&section=2
+https://contabo.com/en/
+https://www.hetzner.com/de/
diff --git a/ml.cpp b/ml.cpp
index 152c5d5..7c2b18f 100644
--- a/ml.cpp
+++ b/ml.cpp
@@ -2,6 +2,7 @@
 #include "ml.h"
 #include "ml_io.h"
 #include "ml_date.h"
+#include "ml_string.h"
 
 #include "csvparser.h"
 #include "sslclient.h"
@@ -49,14 +50,6 @@
 // Convert an object to a string using a string stream conveniently
 #define to_string(x) static_cast<std::ostringstream>((std::ostringstream() << std::dec << x )).str()
 
-// Replace a substring with a replacement string in a source string
-void replace_substring(std::string &src, const std::string &substr, const std::string &replacement) {
-	size_t i = 0;
-	for (i = src.find(substr, i); i != std::string::npos; i = src.find(substr, i)) {
-		src.replace(i, substr.size(), replacement);
-		i += replacement.size();
-	}
-}
 
 // Is this character a valid lisp symbol character
 bool is_symbol(char ch) {
diff --git a/ml_string.cpp b/ml_string.cpp
new file mode 100644
index 0000000..118ef63
--- /dev/null
+++ b/ml_string.cpp
@@ -0,0 +1,14 @@
+
+#include "ml_string.h"
+
+
+
+// Replace a substring with a replacement string in a source string
+void replace_substring(std::string &src, const std::string &substr, const std::string &replacement) {
+	size_t i = 0;
+	for (i = src.find(substr, i); i != std::string::npos; i = src.find(substr, i)) {
+		src.replace(i, substr.size(), replacement);
+		i += replacement.size();
+	}
+}
+
diff --git a/ml_string.h b/ml_string.h
new file mode 100644
index 0000000..20e5249
--- /dev/null
+++ b/ml_string.h
@@ -0,0 +1,12 @@
+
+#pragma once
+
+#include "ml.h"
+
+#include <string>
+
+
+// Replace a substring with a replacement string in a source string
+void replace_substring(std::string &src, const std::string &substr, const std::string &replacement);
+
+