diff --git a/src/main/c/VierGewinnt.c b/src/main/c/VierGewinnt.c
new file mode 100644
index 0000000..2072110
--- /dev/null
+++ b/src/main/c/VierGewinnt.c
@@ -0,0 +1,232 @@
+// Author  fdai7726 
+
+/*
+*Ein Vier-Gewinnt-Spiel, das in der Kommandozeile gespielt wird. 
+*Das Programm ermöglicht es zwei Spielern, abwechselnd Steine in eine Spalte zu setzen,
+*um eine Reihe von vier Steinen horizontal,
+*vertikal oder diagonal zu bilden und das Spiel zu gewinnen.
+*Das Spielfeld wird grafisch in der Kommandozeile dargestellt, 
+*und das Programm überprüft automatisch,
+*ob einer der Spieler gewonnen hat oder ob das Spielfeld voll ist.
+ */
+
+
+
+//Importiere wichtige Bibliotheken
+#include <stdio.h>
+#include <stdlib.h>
+
+//Definiere Feldgröße
+#define ROWS 6
+#define COLS 7
+
+// Definiere Farben
+#define RESET_COLOR "\033[0m"
+#define BLACK "\033[0;30m"
+#define RED "\033[0;31m"
+#define GREEN "\033[0;32m"
+#define YELLOW "\033[0;33m"
+#define BLUE "\033[0;34m"
+#define MAGENTA "\033[0;35m"
+#define CYAN "\033[0;36m"
+#define WHITE "\033[0;37m"
+
+//Funktionsprototypen
+void initializeBoard(char board[ROWS][COLS]);
+void printBoard(char board[ROWS][COLS]);
+void clearScreen();
+int isColumnFull(char board[ROWS][COLS], int col);
+int dropPiece(char board[ROWS][COLS], int col, char player);
+int checkWin(char board[ROWS][COLS], char player);
+int checkHorizontal(char board[ROWS][COLS], char player);
+int checkVertical(char board[ROWS][COLS], char player);
+int checkDiagonalRL(char board[ROWS][COLS], char player);
+void showInvalidInputWarning();
+void showColumnFullMessage();
+void showWinMessage(int player);
+
+
+int main_function() {
+    char board[ROWS][COLS];
+    int  Player = 1; 
+
+    initializeBoard(board);
+    printBoard(board);
+
+    int column;
+    while (1) {
+        printf(YELLOW"Spieler %d, wähle eine Spalte (1-7): "RESET_COLOR, Player);
+
+        scanf("%d", &column);
+        if (column < 1 || column > 7) {
+            showInvalidInputWarning();
+            continue;
+        }
+
+        column--;
+
+        if (isColumnFull(board, column)) {
+            showColumnFullMessage();
+            continue;
+        }
+
+        if (dropPiece(board, column, (Player == 1) ? 'X' : 'O')) {
+            printBoard(board);
+            if (checkWin(board, (Player == 1) ? 'X' : 'O')) {
+                showWinMessage(Player);
+                break;
+            }
+
+            Player = (Player == 1) ? 2 : 1;
+        }
+    }
+
+    return 0;
+}
+void initializeBoard(char board[ROWS][COLS]) {
+    for (int i = 0; i < ROWS; i++) {
+        for (int j = 0; j < COLS; j++) {
+            board[i][j] = ' ';
+        }
+    }
+}
+
+
+void printBoard(char board[ROWS][COLS]) {
+    clearScreen();
+    printf("\n");
+
+    for (int i = 0; i < ROWS; i++) {
+        for (int j = 0; j < COLS; j++) {
+            printf("| %c ", board[i][j]);
+        }
+        printf("|\n");
+
+        for (int j = 0; j < COLS; j++) {
+            printf("----");
+        }
+        printf("-\n");
+    }
+
+    printf("  1   2   3   4   5   6   7\n\n");
+}
+void clearScreen() {
+#ifdef _WIN32
+    system("cls");
+#else
+    system("clear");
+#endif
+}
+
+int isColumnFull(char board[ROWS][COLS], int col) {
+    return (board[0][col] != ' ');
+}
+
+int dropPiece(char board[ROWS][COLS], int col, char player) {
+    for (int i = ROWS - 1; i >= 0; i--) {
+        if (board[i][col] == ' ') {
+            board[i][col] = player;
+            return 1;
+        }
+    }
+
+    return 0; 
+}
+
+
+int checkHorizontal(char board[ROWS][COLS], char player) {
+    for (int row = 0; row < ROWS; row++) {
+        for (int col = 0; col <= COLS - 4; col++) {
+            if (board[row][col] == player &&
+                board[row][col + 1] == player &&
+                board[row][col + 2] == player &&
+                board[row][col + 3] == player) {
+                return 1;  
+            }
+        }
+    }
+    return 0;
+}
+
+int checkVertical(char board[ROWS][COLS], char player) {
+    for (int col = 0; col < COLS; col++) {
+        for (int row = 0; row <= ROWS - 4; row++) {
+            if (board[row][col] == player &&
+                board[row + 1][col] == player &&
+                board[row + 2][col] == player &&
+                board[row + 3][col] == player) {
+                return 1;  
+            }
+        }
+    }
+    return 0;
+}
+
+
+
+int checkDiagonalLR(char board[ROWS][COLS], char player) {
+    for (int row = 0; row <= ROWS - 4; row++) {
+        for (int col = 0; col <= COLS - 4; col++) {
+            if (board[row][col] == player &&
+                board[row + 1][col + 1] == player &&
+                board[row + 2][col + 2] == player &&
+                board[row + 3][col + 3] == player) {
+                return 1;  
+            }
+        }
+    }
+    return 0;
+}
+
+
+
+
+int checkDiagonalRL(char board[ROWS][COLS], char player) {
+    for (int row = 0; row <= ROWS - 4; row++) {
+        for (int col = 3; col < COLS; col++) {
+            if (board[row][col] == player &&
+                board[row + 1][col - 1] == player &&
+                board[row + 2][col - 2] == player &&
+                board[row + 3][col - 3] == player) {
+                return 1;  
+            }
+        }
+    }
+    return 0;
+
+}
+
+int checkWin(char board[ROWS][COLS], char player) {
+    return checkHorizontal(board, player) ||
+           checkVertical(board, player) ||
+           checkDiagonalLR(board, player) ||
+           checkDiagonalRL(board, player);
+}
+
+// Die Funktion showMessage gibt eine formatierte Nachricht aus, wobei die Farbe der Nachricht dynamisch festgelegt werden kann.
+void showMessage(const char* messageColor, const char* message) {
+    printf("%s%s"RESET_COLOR, messageColor, message);
+}
+
+//Die Funktion showInvalidInputWarning zeigt eine Warnung für ungültige Benutzereingaben an. Sie ruft die Funktion showMessage auf, um die Nachricht in roter Farbe auszugeben, die den Benutzer darüber informiert, dass die Eingabe ungültig ist und er eine Spalte zwischen 1 und 7 wählen soll.
+
+void showInvalidInputWarning() {
+    showMessage(RED, "Ungültige Eingabe. Bitte wähle eine Spalte zwischen 1 und 7.\n");
+}
+
+
+
+
+void showColumnFullMessage() {
+    showMessage(RED, "Die ausgewählte Spalte ist bereits belegt. Bitte wähle eine andere Spalte aus.\n");
+}
+
+
+
+void showWinMessage(int player) {
+printf("Spieler %d ist der Gewinner!\n", player);
+
+}
+
+
+
diff --git a/src/main/c/VierGewinnt.h b/src/main/c/VierGewinnt.h
new file mode 100644
index 0000000..689034c
--- /dev/null
+++ b/src/main/c/VierGewinnt.h
@@ -0,0 +1,20 @@
+#ifndef VIERGEWINNT_H
+#define VIERGEWINNT_H
+
+#define ROWS 6
+#define COLS 7
+
+void initializeBoard(char board[ROWS][COLS]);
+void printBoard(char board[ROWS][COLS]);
+int isColumnFull(char board[ROWS][COLS], int col);
+int dropPiece(char board[ROWS][COLS], int col, char player);
+int checkWin(char board[ROWS][COLS], char player);
+int checkHorizontal(char board[ROWS][COLS], char player);
+int checkVertical(char board[ROWS][COLS], char player);
+int checkDiagonalLR(char board[ROWS][COLS], char player);
+int checkDiagonalRL(char board[ROWS][COLS], char player);
+void showMessage(const char* messageColor, const char* message);
+void showInvalidInputMessage();
+void showColumnFullMessage();
+void showWinMessage(int player);
+#endif
diff --git a/src/test/c/test_VierGewinnt.c b/src/test/c/test_VierGewinnt.c
new file mode 100644
index 0000000..1f14b9f
--- /dev/null
+++ b/src/test/c/test_VierGewinnt.c
@@ -0,0 +1,151 @@
+#include "unity.h"
+#include "VierGewinnt.h"  
+
+void setUp(void) {
+}
+
+void tearDown(void) {
+}
+
+
+void test_dropPiece_ValidMove(void) {
+    char board[6][7];
+    initializeBoard(board);
+
+    TEST_ASSERT_EQUAL_INT(1, dropPiece(board, 3, 'X')); 
+}
+
+
+void test_dropPiece_FullColumn(void) {
+    char board[6][7] = {
+        {'X', 'O', 'X', 'O', 'X', 'O', 'X'},
+        {'O', 'X', 'O', 'X', 'O', 'X', 'O'},
+        {'X', 'O', 'X', 'O', 'X', 'O', 'X'},
+        {'O', 'X', 'O', 'X', 'O', 'X', 'O'},
+        {'X', 'O', 'X', 'O', 'X', 'O', 'X'},
+        {'O', 'X', 'O', 'X', 'O', 'X', 'O'}
+    };
+
+    TEST_ASSERT_EQUAL_INT(0, dropPiece(board, 3, 'X'));  // Spalte ist voll, sollte 0 zurückgeben
+}
+
+
+void test_checkWin_Horizontal_X(void) {
+    char board[6][7] = {
+        {'X', 'X', ' ', ' ', ' ', ' ', ' '},
+        {'O', 'O', 'O', ' ', ' ', ' ', ' '},
+        {' ', ' ', ' ', ' ', ' ', ' ', ' '},
+        {' ', 'X', 'X', 'X', 'X', ' ', ' '},
+        {' ', ' ', ' ', ' ', ' ', ' ', ' '},
+        {' ', ' ', ' ', ' ', ' ', ' ', ' '}
+    };
+
+    TEST_ASSERT_EQUAL_INT(1, checkWin(board, 'X'));  // Horizontale Gewinnsituation für 'X'
+}
+
+void test_checkWin_Horizontal_O(void) {
+    char board[6][7] = {
+        {'X', 'X', ' ', ' ', ' ', ' ', ' '},
+        {'O', 'O', 'O', 'O', ' ', ' ', ' '},
+        {' ', ' ', ' ', ' ', ' ', ' ', ' '},
+        {' ', 'X', 'X', ' ', 'X', ' ', ' '},
+        {' ', ' ', ' ', ' ', ' ', ' ', ' '},
+        {' ', ' ', ' ', ' ', ' ', ' ', ' '}
+    };
+
+    TEST_ASSERT_EQUAL_INT(1, checkWin(board, 'O'));  // Horizontale Gewinnsituation für 'X'
+}
+
+void test_checkWin_Diagonal_X(void) {
+    char board[6][7] = {
+        {'X', 'X', ' ', ' ', ' ', ' ', ' '},
+        {'O', 'O', 'O', 'X', ' ', ' ', ' '},
+        {' ', 'X', ' ', ' ', ' ', ' ', ' '},
+        {' ', 'X', 'X', 'X', 'X', ' ', ' '},
+        {' ', ' ', ' ','X', ' ', ' ', ' '},
+        {' ', ' ', ' ', ' ', ' ', 'X', ' '}
+    };
+
+    TEST_ASSERT_EQUAL_INT(1, checkWin(board, 'X'));  // Horizontale Gewinnsituation für 'X'
+}
+
+
+
+
+
+void test_checkWin_Diagonal_O(void) {
+    char board[6][7] = {
+        {'X', 'X', ' ', ' ', ' ', ' ', ' '},
+        {'O', 'O', 'O', 'X', ' ', ' ', ' '},
+        {' ', 'O', ' ', ' ', ' ', ' ', ' '},
+        {' ', 'X', 'O', 'X', 'X', ' ', ' '},
+        {' ', ' ', ' ','O', ' ', ' ', ' '},
+        {' ', ' ', ' ', ' ', ' ', 'X', ' '}
+    };
+
+    TEST_ASSERT_EQUAL_INT(1, checkWin(board, 'O'));  // Horizontale Gewinnsituation für 'X'
+}
+
+
+
+
+
+
+
+void test_checkWin_Vertical_X(void) {
+    char board[6][7] = {
+        {'X', 'O', ' ', ' ', ' ', ' ', ' '},
+        {'X', 'O', ' ', ' ', ' ', ' ', ' '},
+        {'X', 'O', ' ', ' ', ' ', ' ', ' '},
+        {'X', ' ', ' ', ' ', ' ', ' ', ' '},
+        {' ', ' ', ' ', ' ', ' ', ' ', ' '},
+        {' ', ' ', ' ', ' ', ' ', ' ', ' '}
+    };
+
+    TEST_ASSERT_EQUAL_INT(1, checkWin(board, 'X'));  // Vertikale Gewinnsituation für 'X'
+}
+
+
+
+void test_checkWin_Vertical_O(void) {
+    char board[6][7] = {
+        {'X', 'O', ' ', ' ', ' ', ' ', ' '},
+        {'X', 'O', ' ', ' ', ' ', ' ', ' '},
+        {'X', 'O', ' ', ' ', ' ', ' ', ' '},
+        {' ', 'O', ' ', ' ', ' ', ' ', ' '},
+        {' ', ' ', ' ', ' ', ' ', ' ', ' '},
+        {' ', ' ', ' ', ' ', ' ', ' ', ' '}
+    };
+
+    TEST_ASSERT_EQUAL_INT(1, checkWin(board, 'O'));  // Vertikale Gewinnsituation für 'X'
+}
+void test_checkWin_NoWinner(void) {
+char board[6][7] = {
+        {'X', 'O', 'X', 'O', 'X', 'O', 'X'},
+        {'O', 'X', 'O', 'X', 'O', 'X', 'O'},
+        {'O', 'X', 'O', 'X', 'O', 'X', 'O'},
+        {'O', 'X', 'O', 'X', 'O', 'X', 'O'},
+        {'X', 'O', 'X', 'O', 'X', 'O', 'X'},
+        {'O', 'X', 'O', 'X', 'O', 'X', 'O'}
+    };
+
+
+
+
+    TEST_ASSERT_EQUAL_INT(0, checkWin(board, 'X'));  // Kein Gewinner, horizontale Reihe ist voll
+    TEST_ASSERT_EQUAL_INT(0, checkWin(board, 'O'));  // Kein Gewinner, horizontale Reihe ist voll
+}
+
+void test_isColumnFull(void) {
+    char board[6][7] = {
+        {'X', 'O', 'X', 'O', 'X', 'O', 'X'},
+        {'O', 'X', 'O', 'X', 'O', 'X', 'O'},
+        {'X', 'O', 'X', 'O', 'X', 'O', 'X'},
+        {'O', 'X', 'O', 'X', 'O', 'X', 'O'},
+        {'X', 'O', 'X', 'O', 'X', 'O', 'X'},
+        {'O', 'X', 'O', 'X', 'O', 'X', 'O'}
+    };
+
+    TEST_ASSERT_EQUAL_INT(1, isColumnFull(board, 3));  // Column 3 is full
+}
+
diff --git a/src/test/c/test_test.c b/src/test/c/test_test.c
deleted file mode 100644
index 4f61ea7..0000000
--- a/src/test/c/test_test.c
+++ /dev/null
@@ -1,28 +0,0 @@
-#ifdef TEST
-
-#include "unity.h"
-
-#include "test.h"
-
-void setUp(void)
-{
-}
-
-void tearDown(void)
-{
-}
-
-void test_test__return_5(void)
-{
-    /* arrange */
-	int expected = 5;
-	int actual;
-
-    /* act */
-	actual = return_5();
-
-    /* assert */
-	TEST_ASSERT_EQUAL_INT(expected, actual);
-}
-
-#endif // TEST