diff --git a/src/c/funktionen.c b/src/c/funktionen.c
index d3c77a8..07470bf 100644
--- a/src/c/funktionen.c
+++ b/src/c/funktionen.c
@@ -21,32 +21,6 @@ int choose_program() {
     return choice;
 }
 
-int addThreeNumbers(int num1, int num2, int num3) {
-    return num1 + num2 + num3;
-}
-
-int multiply(int num1, int num2) {
-    return num1 * num2;
-}
-
-int subtract(int num1, int num2) {
-    return num1 - num2;
-}
-
-int divide(int num1, int num2) {
-    return num1 / num2;
-}
-
-int power(int base, int power) {
-    int speicher = 1;
-
-    for (int i = 0; i < power; i++) {
-        speicher *= base;
-    }
-
-    return speicher;
-}
-
 int x_wins_00_10_20(char board[][3]) {
     if (board[0][0] == 'X' && board[1][0] == 'X' && board[2][0] == 'X') {
         return 1;
@@ -95,6 +69,12 @@ int x_wins_02_11_20(char board[][3]) {
     }    
 }
 
+int o_wins_00_10_20(char board[][3]) {
+    if (board[0][0] == 'O' && board[1][0] == 'O' && board[2][0] == 'O') {
+	return 1;
+    }
+}
+
 int stringCharacterCounter(char string[]) {
     int stringLength = 0;
 
@@ -117,12 +97,30 @@ int characterAppearanceInString(char c, char string[]) {
     return appear;
 }
 
-int calculateCurrent(int voltage, int resistance) {
-    return voltage / resistance;
+int addThreeNumbers(int num1, int num2, int num3) {
+    return num1 + num2 + num3;
 }
 
-int calculatePressure(int force, int area) {
-    return force / area;
+int multiply(int num1, int num2) {
+    return num1 * num2;
+}
+
+int subtract(int num1, int num2) {
+    return num1 - num2;
+}
+
+int divide(int num1, int num2) {
+    return num1 / num2;
+}
+
+int power(int base, int power) {
+    int speicher = 1;
+
+    for (int i = 0; i < power; i++) {
+        speicher *= base;
+    }
+
+    return speicher;
 }
 
 // Function to calculate the sine of an angle in radians
@@ -329,10 +327,14 @@ float remainderValue(float x, float y) {
     return fmod(x, y);
 }
 
-float f(float m) {
-    return m * 9.81;
-}
-
 float calculateWeight(float mass) {
     return mass * 9.81;
+}
+
+int calculateCurrent(int voltage, int resistance) {
+    return voltage / resistance;
+}
+
+int calculatePressure(int force, int area) {
+    return force / area;
 }
\ No newline at end of file
diff --git a/src/c/funktionen.h b/src/c/funktionen.h
index 050ff6e..9674e0a 100644
--- a/src/c/funktionen.h
+++ b/src/c/funktionen.h
@@ -35,6 +35,9 @@ int x_wins_02_12_22(char board[][3]);
 int x_wins_00_01_02(char board[][3]);
 //prüft, ob X bei Index 00, 01, 02 ist
 
+int o_wins_00_10_20(char board[][3]);
+// prüft, ob O bei Index 00, 10, 20 ist.
+
 int x_wins_10_11_12(char board[][3]);
 //prüft, ob X bei Index 10, 11, 12 ist
 
diff --git a/src/test/test_funktionen.c b/src/test/test_funktionen.c
index 3b70910..439b5ab 100644
--- a/src/test/test_funktionen.c
+++ b/src/test/test_funktionen.c
@@ -215,16 +215,16 @@ void test_x_wins_onIndex_00_01_02(void)
     TEST_ASSERT_EQUAL_INT(expected, actual);
 }
 
-void test_x_wins_onIndex_10_11_12(void)
+void test_o_wins_onIndex_00_10_20(void)
 {
     /* arrange */
     int actual;
     int expected = 1;
     
-    char board[][3] = {{' ',' ',' '}, {'X','X','X'}, {' ',' ',' '}};
+    char board[][3] = {{'O',' ',' '}, {'O',' ',' '}, {'O',' ',' '}};
 
     /* act */
-    actual = x_wins_10_11_12(board);
+    actual = o_wins_00_10_20(board);
 
     /* assert */
     TEST_ASSERT_EQUAL_INT(expected, actual);