refactoring: renamed some vars

src/main/c/Georg/tictactoe.c

@@ -134,10 +134,10 @@ void printBoard(){
     }
     printf("\n");
 
-    for (int i = 0; i < 3; ++i) {
+    for (int line = 0; line < 3; ++line) {
         printf("| ");
-        for (int j = 0; j < 3; ++j) {
-            if( GAME.board[i][j] == true )
+        for (int column = 0; column < 3; ++column) {
+            if( GAME.board[line][column] == true )
                 printf( "X" );
             else
                 printf ( " " );