added a function that evaluates user input

src/main/c/Georg/tictactoe.c

@@ -1,5 +1,6 @@
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 
 #include "tictactoe.h"
 
@@ -21,4 +22,10 @@ struct ticTacToe createTicTacToe() {
     struct ticTacToe newGame;
     newGame.currentState = 0;
     return newGame;
+}
+
+int handleState( char* input ){
+    if( strcmp(input, "start game") == 0 ){
+        return 1;
+    }
 }

src/main/c/Georg/tictactoe.h

@@ -8,5 +8,6 @@ struct ticTacToe{
 char* getWelcomeMessage();
 char* getRulesMessage();
 struct ticTacToe createTicTacToe();
+int handleState( char* input );
 
 #endif //TICTACTOE_H

src/test/c/Georg/test_tictactoe.c

@@ -49,4 +49,16 @@ void test_initial_state(void){
 
     // assert
     TEST_ASSERT_EQUAL_INT( expectedState, newGame.currentState );
+}
+
+void test_userInput(void){
+    // arrange
+    int expectedState = 1;
+    char* input = "start game";
+
+    // act
+    int actualState = handleState( input );
+
+    // assert
+    TEST_ASSERT_EQUAL_INT( expectedState, actualState );
 }