diff --git a/libraries/AvrHeap/avrheap.cpp b/libraries/AvrHeap/avrheap.cpp
index 93d6e9b7..fa9b272e 100644
--- a/libraries/AvrHeap/avrheap.cpp
+++ b/libraries/AvrHeap/avrheap.cpp
@@ -1,7 +1,7 @@
 //
 //    FILE: avrheap.cpp
 //  AUTHOR: Rob Tillaart
-// VERSION: 0.2.2
+// VERSION: 0.2.3
 // PURPOSE: experimental library for heap Arduino UNO
 //     URL: https://github.com/RobTillaart/avrheap
 //
@@ -10,6 +10,7 @@
 // http://forum.arduino.cc/index.php?topic=355660
 //
 // HISTORY
+// 0.2.3    2021-05027  add Arduino-CI
 // 0.2.2    2020-12-13  arduino-CI + minimal unit tests
 // 0.2.1    2020-05-27  update library.json
 // 0.2.0    2020-03-27  Removed support for pre 1.0 version
@@ -21,8 +22,10 @@
 // 0.1.01 - refactor, added startAddress()
 // 0.1.00 - initial version
 
+
 #include "avrheap.h"
 
+
 struct __freelist
 {
   size_t size;
@@ -46,18 +49,21 @@ size_t hNibble(Print& p, byte val)
   return p.write(val + (val<10 ? '0' : 'A'-10));
 }
 
+
 size_t hByte(Print& p, byte val)
 {
   size_t len = hNibble(p, val >> 4);
   return len + hNibble(p, val & 0x0F);
 }
 
+
 size_t hWord(Print& p, uint16_t val)
 {
   size_t len = hByte(p, (byte)(val >> 8));
   return len + hByte(p, (byte)(val & 0xFF) );
 }
 
+
 size_t dumpR(Print& p, byte* adr, int len)
 {
   size_t glen = 0;
@@ -91,11 +97,13 @@ size_t dumpR(Print& p, byte* adr, int len)
   return glen;
 }
 
+
 size_t dumpAlloced(byte *ptr, bool withDump)
 {
   return dumpAlloced(Serial, ptr, withDump);
 }
 
+
 size_t dumpAlloced(Print& p, byte *ptr, bool withDump)
 {
   size_t len = hWord(p, (uint16_t)ptr);
@@ -123,16 +131,17 @@ size_t dumpAlloced(Print& p, byte *ptr, bool withDump)
 }
 
 
-
 Avrheap::Avrheap()
 {
 };
 
+
 bool Avrheap::isFragmented()
 {
   return freeListCount() > 0;
 };
 
+
 uint16_t Avrheap::freeListCount()
 {
   uint16_t count = 0;
@@ -140,6 +149,7 @@ uint16_t Avrheap::freeListCount()
   return count;
 }
 
+
 uint16_t Avrheap::freeListSize()
 {
   uint16_t total = 0;
@@ -151,6 +161,7 @@ uint16_t Avrheap::freeListSize()
   return total;
 }
 
+
 void Avrheap::freeListWalk(bool withDump)
 {
   int elements = freeListCount();
@@ -182,11 +193,13 @@ void Avrheap::freeListWalk(bool withDump)
   }
 }
 
+
 uint16_t Avrheap::startAddress()
 {
   return (uint16_t) &__heap_start;
 }
 
+
 void Avrheap::dumpHeap(uint16_t count)
 {
   hWord(Serial, (uint16_t)RAMEND);
@@ -217,10 +230,12 @@ void Avrheap::dumpHeap(uint16_t count)
   dumpR(Serial, (byte*)startAddress(), count);
 }
 
+
 size_t Avrheap::heapWalk(bool withDump) {
   return heapWalk(Serial, withDump);
 }
 
+
 // EXPERIMENTAL
 size_t Avrheap::heapWalk(Print& pr, bool withDump) const
 {
@@ -248,6 +263,7 @@ size_t Avrheap::heapWalk(Print& pr, bool withDump) const
   return len;
 }
 
+
 bool Avrheap::inFreeList(uint16_t addr)
 {
   for (struct __freelist* p = __flp; p; p = p->next)
@@ -257,6 +273,7 @@ bool Avrheap::inFreeList(uint16_t addr)
   return false;
 }
 
+
 uint16_t Avrheap::freeListLargest()
 {
   uint16_t largest = 0;
@@ -267,10 +284,12 @@ uint16_t Avrheap::freeListLargest()
   return largest;
 }
 
+
 size_t Avrheap::printTo(Print& p) const
 {
   size_t len = heapWalk(p, true);
   return len;
 }
 
+
 // --- END OF FILE ---
diff --git a/libraries/AvrHeap/avrheap.h b/libraries/AvrHeap/avrheap.h
index 262520e6..8f9f92b5 100644
--- a/libraries/AvrHeap/avrheap.h
+++ b/libraries/AvrHeap/avrheap.h
@@ -2,19 +2,23 @@
 //
 //    FILE: avrheap.h
 //  AUTHOR: Rob Tillaart
-// VERSION: 0.2.2
+// VERSION: 0.2.3
 // PURPOSE: experimental library for heap Arduino UNO
 // HISTORY: See avrheap.cpp
 //
 
+
 #if !defined(ARDUINO_ARCH_AVR)
   #error “Avrheap library only AVR boards, tested only with UNO.”
 #endif
 
+
 #include "Arduino.h"
 #include "Printable.h"
 
-#define AVRHEAP_LIB_VERSION "0.2.2"
+
+#define AVRHEAP_LIB_VERSION     (F("0.2.3"))
+
 
 class Avrheap : public Printable
 {
@@ -38,6 +42,7 @@ private:
   bool     inFreeList(uint16_t addr);
 };
 
+
 size_t hNibble(Print& p, byte val);
 size_t hByte(Print& p, byte val);
 size_t hWord(Print& p, uint16_t val);
@@ -45,4 +50,5 @@ size_t dumpR(Print& p, byte* adr, int len);
 size_t dumpAlloced(Print& p, byte *ptr, bool withDump = true);
 size_t dumpAlloced(byte *ptr, bool withDump = true);
 
+
 // -- END OF FILE --
diff --git a/libraries/AvrHeap/examples/heapdemo/heapdemo.ino b/libraries/AvrHeap/examples/heapdemo/heapdemo.ino
index 413eb261..4a9ec045 100644
--- a/libraries/AvrHeap/examples/heapdemo/heapdemo.ino
+++ b/libraries/AvrHeap/examples/heapdemo/heapdemo.ino
@@ -14,6 +14,7 @@ Avrheap myheap;
 
 int *par[10];
 
+
 void setup()
 {
   Serial.begin(115200);
@@ -89,10 +90,10 @@ void setup()
   Serial.println("\ndone");
 }
 
+
 void loop()
 {
 }
 
 
 // -- END OF FILE --
-
diff --git a/libraries/AvrHeap/examples/heapdemo1 ( - 0.1.03)/heapdemo1.ino b/libraries/AvrHeap/examples/heapdemo1_pre_0.1.03/heapdemo1_pre_0.1.03.ino
similarity index 97%
rename from libraries/AvrHeap/examples/heapdemo1 ( - 0.1.03)/heapdemo1.ino
rename to libraries/AvrHeap/examples/heapdemo1_pre_0.1.03/heapdemo1_pre_0.1.03.ino
index 5d86b7bf..c674f8b8 100644
--- a/libraries/AvrHeap/examples/heapdemo1 ( - 0.1.03)/heapdemo1.ino	
+++ b/libraries/AvrHeap/examples/heapdemo1_pre_0.1.03/heapdemo1_pre_0.1.03.ino
@@ -1,7 +1,7 @@
 //
-//    FILE: heapdemo.ino
+//    FILE: heapdemo1_pre_0.1.03.ino
 //  AUTHOR: Rob Tillaart
-// VERSION: 0.1.00
+// VERSION: 0.1.1
 // PURPOSE: heapdemo
 //    DATE: 2015-10-25
 //     URL: https://github.com/RobTillaart/avrheap
diff --git a/libraries/AvrHeap/examples/heapdemo2/heapdemo2.ino b/libraries/AvrHeap/examples/heapdemo2/heapdemo2.ino
index 25e77934..422e8720 100644
--- a/libraries/AvrHeap/examples/heapdemo2/heapdemo2.ino
+++ b/libraries/AvrHeap/examples/heapdemo2/heapdemo2.ino
@@ -1,31 +1,36 @@
 //
 //    FILE: heapdemo2.ino
 //  AUTHOR: Rob Tillaart
-// VERSION: 0.1.0
+// VERSION: 0.1.1
 // PURPOSE: demo AvrHeap class
 //    DATE: 2015-10-25
 //     URL: http://forum.arduino.cc/index.php?topic=355660
 //          https://github.com/RobTillaart/avrheap
 //
 
+
 #if !defined(ARDUINO_ARCH_AVR)
 
+
 void setup()
 {
 }
 
+
 void loop()
 {
 }
 
 #else
 
+
 #include "avrheap.h"
 
 Avrheap myheap;
 
 int *par[10];
 
+
 void setup()
 {
   int seed = analogRead(A0) + analogRead(A3) + analogRead(A2);
@@ -35,7 +40,7 @@ void setup()
   Serial.print(F("Start "));
   Serial.print(F(__FILE__));
   Serial.print(F("\nLibVersion "));
-  Serial.println(F(AVRHEAP_LIB_VERSION));
+  Serial.println(AVRHEAP_LIB_VERSION);
 
   Serial.println();
   Serial.print(F("HEAP ADDR: "));
@@ -75,10 +80,12 @@ void setup()
   Serial.println(F("done"));
 }
 
+
 void loop()
 {
 }
 
+
 #endif
 
 // -- END OF FILE --
diff --git a/libraries/AvrHeap/library.json b/libraries/AvrHeap/library.json
index 007e6860..08208840 100644
--- a/libraries/AvrHeap/library.json
+++ b/libraries/AvrHeap/library.json
@@ -15,7 +15,8 @@
     "type": "git",
     "url": "https://github.com/RobTillaart/avrheap.git"
   },
-  "version":"0.2.2",
+  "version": "0.2.3",
+  "license": "MIT",
   "frameworks": "arduino",
   "platforms": "avr"
 }
diff --git a/libraries/AvrHeap/library.properties b/libraries/AvrHeap/library.properties
index 28adfc50..4f04e9db 100644
--- a/libraries/AvrHeap/library.properties
+++ b/libraries/AvrHeap/library.properties
@@ -1,5 +1,5 @@
 name=AvrHeap
-version=0.2.2
+version=0.2.3
 author=Rob Tillaart <rob.tillaart@gmail.com>
 maintainer=Rob Tillaart <rob.tillaart@gmail.com>
 sentence=Library to runtime analyze the structure of the heap (AVR328).
diff --git a/libraries/AvrHeap/test/unit_test_001.cpp_no test_possible b/libraries/AvrHeap/test/unit_test_001.cpp_no test_possible
index 9ba427ad..64db5b81 100644
--- a/libraries/AvrHeap/test/unit_test_001.cpp_no test_possible	
+++ b/libraries/AvrHeap/test/unit_test_001.cpp_no test_possible	
@@ -29,17 +29,22 @@ unittest_setup()
 {
 }
 
+
 unittest_teardown()
 {
 }
 
+
 unittest(test_constructor)
 {
   Avrheap myheap;
   
   fprintf(stderr, "no unit tests yet");
+
 }
 
+
 unittest_main()
 
+
 // --------