diff --git a/src/c/player.c b/src/c/player.c
new file mode 100644
index 0000000..c789fed
--- /dev/null
+++ b/src/c/player.c
@@ -0,0 +1,17 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdbool.h>
+
+#include "player.h"
+
+
+// PLAYER INVENTORY
+Player addItemToInventory(Item *availableItems, int itemIndex, Player actualPlayer)
+{
+    int counter = actualPlayer.itemCounter;
+    actualPlayer.itemInventory[counter] = availableItems[itemIndex - 1]; // -1 to get right index (items begin - 1,2,3,4...)
+    actualPlayer.itemCounter += 1;
+
+    return actualPlayer;
+}
\ No newline at end of file
diff --git a/src/c/player.h b/src/c/player.h
new file mode 100644
index 0000000..25a69be
--- /dev/null
+++ b/src/c/player.h
@@ -0,0 +1,16 @@
+#ifndef PLAYER_H
+#define PLAYER_H
+
+#include "items.h"
+
+typedef struct
+{
+    int id;
+    int itemCounter;
+    Item itemInventory[100];
+    int wallet;
+} Player;
+
+Player addItemToInventory(Item *availableItem, int itemIndex, Player actualPlayer);
+
+#endif
\ No newline at end of file
diff --git a/test/c/test_player.c b/test/c/test_player.c
new file mode 100644
index 0000000..bbdb496
--- /dev/null
+++ b/test/c/test_player.c
@@ -0,0 +1,33 @@
+#ifdef TEST
+
+#include "unity.h"
+#include "player.h"
+#include "items.h"
+#include "nav_helper.h"
+
+void setUp(void)
+{
+}
+
+void tearDown(void)
+{
+}
+
+void test_addItemToInventory(void)
+{
+    /* arrange */
+    // Hier die Werte eingeben/deklarieren
+    int shopItemIndex = 1;
+    Player actualPlayer;
+    Item *availableItems = getItems("./src/content/items.map");
+
+    /* act */
+    // Die Funktion wird ausgeführt
+    actualPlayer = addItemToInventory(availableItems, shopItemIndex, actualPlayer);
+
+    /* assert */
+    // Vergleichen mit Inhalt von game.Map File
+    TEST_ASSERT_EQUAL_INT(shopItemIndex, actualPlayer.itemInventory[0].id);
+}
+
+#endif // TEST