diff --git a/.gitignore b/.gitignore
index 65d6b54..21b66b6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -64,4 +64,5 @@ install_manifest.txt
 compile_commands.json
 CTestTestfile.cmake
 _deps
-
+# ---> Extra
+vgcore.*
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9732d65..7f7868e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,5 +1,5 @@
 project(advanced_C_standard_library C)
-set_property(GLOBAL PROPERTY C_STANDARD 99)
+set_property(GLOBAL PROPERTY C_STANDARD 11)
 cmake_minimum_required(VERSION 3.9)
 include_directories(src)
 file(GLOB SOURCES "src/*.c")
diff --git a/build_and_run.sh b/build_and_run.sh
index b685e00..6d2afb1 100755
--- a/build_and_run.sh
+++ b/build_and_run.sh
@@ -1,3 +1,4 @@
 #!/bin/sh
+cmake .
 make
 ./build/test.out
diff --git a/src/array.c b/src/array.c
new file mode 100644
index 0000000..f5e604f
--- /dev/null
+++ b/src/array.c
@@ -0,0 +1,37 @@
+#include <stdio.h>
+#include <stddef.h>
+#include <stdlib.h>
+
+union arraylist_meta {
+        max_align_t dummy_align;
+        struct {
+            size_t len;
+            size_t cap;
+            size_t sizeof_one_element;
+        };
+    };
+
+void* arraylist_create(size_t array_size, size_t sizeof_one_element) {
+	union arraylist_meta *arraylist_new = malloc(array_size * sizeof_one_element + sizeof*arraylist_new);
+	arraylist_new->len = array_size;
+	arraylist_new->cap = array_size;
+	arraylist_new->sizeof_one_element = sizeof_one_element;
+	return arraylist_new+1;
+}
+
+void* arraylist_append(void *arraylist_void, void *element_void) {
+	char *element = element_void;
+	union arraylist_meta *arraylist = arraylist_void;
+	--arraylist;
+	if(arraylist->len == arraylist->cap) {
+		arraylist->cap = arraylist->len + 10;
+		arraylist = realloc(arraylist, arraylist->cap * arraylist->sizeof_one_element + sizeof *arraylist);
+	}
+	char *arraylist_char = (char*)(arraylist+1);
+	arraylist_char += arraylist->sizeof_one_element * arraylist->len;
+	for(size_t i = 0; i < arraylist->sizeof_one_element; ++arraylist_char, ++element, ++i) {
+		*arraylist_char = *element;
+	}
+	++arraylist->len;
+	return arraylist+1;
+}
diff --git a/src/array.h b/src/array.h
new file mode 100644
index 0000000..7eb58fd
--- /dev/null
+++ b/src/array.h
@@ -0,0 +1,5 @@
+#ifndef array_h
+#define array_h
+void* arraylist_create(size_t array_size, size_t sizeof_one_element);
+void* arraylist_append(void *arraylist_void, void *element_void);
+#endif
diff --git a/src/main.c b/src/main.c
index e921ebe..d960e22 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,4 +1,10 @@
 #include <stdio.h>
+#include "array.h"
+
 int main() {
-	printf("baum\n");
+	int *int_array = arraylist_create(2, sizeof (int));
+	int_array[0] = 28;
+	int_array[1] = 20;
+	for(int i = 0; i < 100; ++i) int_array = arraylist_append(int_array, &i);
+	for(int i = 0; i < 102; ++i) printf("Index: %d Value: %d\n", i, int_array[i]);
 }