add function to parse the game commands

src/main/c/Georg/tictactoe.c

@@ -149,6 +149,19 @@ void printBoard(){
     printf("\n");
 }
 
+int* getMarkerParameters( char* input ){
+    int* array = (int*)malloc(2 * sizeof(int));
+
+    int index = strchr(input, ',') - input;
+    int firstArgument = input[index-1] - '0';
+    int secondArgument = input[index+1] - '0';
+
+    array[0] = firstArgument;
+    array[1] = secondArgument;
+
+    return array;
+}
+
 int startGame( int code ){
     if( code == -1 ){ // command test
         return 1;

src/main/c/Georg/tictactoe.h

@@ -32,6 +32,7 @@ struct ticTacToe createTicTacToe();
 int handleCommand( char* input );
 void initializeBoard( bool board[3][3] );
 int handleGameInput( char* input );
+int* getMarkerParameters();
 
 /* commands */
 commandFunction getCommandById(int id);

src/test/c/Georg/test_tictactoe.c

@@ -139,3 +139,17 @@ void test_handleGameInput(void){
     // assert
     TEST_ASSERT_EQUAL_INT( expectedCommand, actualState );
 }
+
+void test_getMarkerParameters(void){
+    // arrange
+    char* teststring = "set 3,3";
+    int expectedParams[2] = {3, 3};
+
+    // act
+    int* actualParams = getMarkerParameters( teststring );
+
+    // assert
+    for( int i = 0; i < 2; i++ ){
+        TEST_ASSERT_EQUAL_INT( expectedParams[i], actualParams[i] );
+    }
+}