refactoring: comment a function

src/main/c/Georg/tictactoe.c

@@ -95,6 +95,11 @@ void initializeBoard( bool board[BORAD_SIZE][BORAD_SIZE] ){
     }
 }
 
+/**
+ * The function checks if the user has written a valid command
+ * @param input
+ * @return 1 for a valid command and 0 for an invalid one.
+ */
 int handleGameInput( char* input ){
     if( strstr(input, "set") != NULL ){
         return 1;