diff --git a/CMDList/CMDList.c b/CMDList/CMDList.c
index dde5b50..ff9cca1 100644
--- a/CMDList/CMDList.c
+++ b/CMDList/CMDList.c
@@ -1,7 +1,9 @@
 #include "CMDList.h"
 
 #include <stdlib.h>
+#include <stdbool.h>
 #include <string.h>
+#include <stdio.h>
 
 // initilises a CMDList_t with all NULL pointers
 CMDList_t* CMDList_init()
@@ -12,52 +14,143 @@ CMDList_t* CMDList_init()
 }
 
 // free up the full tree from memory
+// does not free up the commands
 int CMDList_deinit(CMDList_t *list)
 {
-	CMDList_t* chars[26]; //TODO: cast list to array
+	CMDList_t** list_p = (CMDList_t**)list;
+	// printf("deinit %p\n", (void*)list);
+	// printf("deinit e %p\n", list->e);
 
 	for (int i = 0; i < 26; i++)
 	{
-		if (chars[i] != NULL)
+		if (*(list_p + i) != NULL)
 		{
-			CMDList_deinit(chars[i]);
+			// printf("deinit %i\n", i);
+			CMDList_deinit(*(list_p + i));
 		}
 	}
 
-	free(list);
+	//TODO: fix "free(): invalid pointer"
+	// free(list);
 	return 0;
 }
 
 // add a command in the command tree
 int CMDList_add(CMDList_t *list, CMD_t* cmd)
 {
-	char* read_p = cmd;
-	CMDList_t* list_p = list;
+	int returnCode = 0;
+	char* read_p = cmd->cmd;
+	CMDList_t** list_p = (CMDList_t**)list;
 
-	while (
-		   (read_p != NULL)
-		&& (*read_p != ' ') // space ends the command
-		&& (*read_p != '\n') // end of line
-		&& (*read_p != '\r') // end of line
-		&& (*read_p != 0) // end of string
-		&& (read_p - (char*)cmd < 500)
-	)
+	if (read_p == NULL)
+	{ // cmd is missing a string for the commnad name
+		returnCode = -1;
+	}
+
+	while (returnCode == 0)
 	{
-		char c = *read_p & (~0x20); // to uppercase
-		if ((*read_p >= 'A') && (*read_p <= 'Z'))
-		{
-			read_p += (*read_p - 'A') * sizeof(CMDList_t*);
-			if (*((CMDList_t**)read_p) == NULL)
-			{
-				read_p = malloc(sizeof(CMDList_t));
+		char c = *read_p & (~0x20); // convert to uppercase
+		if ((c >= 'A') && (c <= 'Z'))
+		{ // valid character
+
+			// get memory address of the caracter in the CMDList
+			list_p += (c - 'A');
+
+			if (*list_p == NULL)
+			{ // it does not point to another list
+				// allocate a new list for it
+				*list_p = CMDList_init();
+				if (list_p == NULL)
+				{ // allocation faild (memory full?)
+					returnCode = -2;
+				}
+
+				// update list_p for the next list
+				list_p = (CMDList_t**)(*list_p);
 			}
 			else
-			{
-				read_p = *((CMDList_t**)read_p);
+			{ // it points to an other list
+				// update pointer to this list
+				list_p = (CMDList_t**)(*list_p);
 			}
 		}
+		else
+		{ // invalid caracter
+			break;
+		}
+
+		// read next character
+		read_p++;
 	}
+
+	if (returnCode >= 0)
+	{ // no errors
+		
+		if (((CMDList_t*)list_p)->cmd != NULL)
+		{ // replacing a command
+			returnCode = 1;
+		}
+		// add command in it's spot
+		((CMDList_t*)list_p)->cmd = cmd;
+	}
+
+
+	return returnCode;
 }
 
 // search command in the tree
-int CMDList_get(CMDList_t *list, char* cmd);
+CMD_t* CMDList_get(CMDList_t *list, char* cmd)
+{
+	bool found = true;
+	CMD_t* cmd_object = NULL;
+	char* read_p = cmd;
+	CMDList_t** list_p = (CMDList_t**)list;
+
+	while (found)
+	{
+		//TODO: mayby make a copy before converting to upper case
+		char c = *read_p & (~0x20); // convert to uppercase
+		if ((c >= 'A') && (c <= 'Z'))
+		{ // valid character
+
+			// get memory address of the caracter in the CMDList
+			list_p += (c - 'A');
+
+			if (*list_p == NULL)
+			{ // no command found
+				found = false;
+			}
+			else
+			{ // it points to an other list
+				// update pointer to this list
+				list_p = (CMDList_t**)(*list_p);
+			}
+		}
+		else
+		{ // invalid caracter
+			break;
+		}
+
+		// read next character
+		read_p++;
+	}
+
+	if (found)
+	{ // list found for command
+		if (((CMDList_t*)list_p)->cmd == NULL)
+		{ // command incomplete
+			found = false;
+			cmd_object = NULL;
+		}
+		else
+		{
+			cmd_object = ((CMDList_t*)list_p)->cmd;
+		}
+	}
+	else
+	{
+		cmd_object = NULL;
+	}
+
+	return cmd_object;
+}
diff --git a/CMDList/CMDList.h b/CMDList/CMDList.h
index b19004f..df580c8 100644
--- a/CMDList/CMDList.h
+++ b/CMDList/CMDList.h
@@ -49,6 +49,6 @@ extern int CMDList_deinit(CMDList_t *list);
 extern int CMDList_add(CMDList_t *list, CMD_t* cmd);
 
 // search command in the tree
-extern int CMDList_get(CMDList_t *list, char* cmd);
+extern CMD_t* CMDList_get(CMDList_t *list, char* cmd);
 
 #endif
\ No newline at end of file