public boolean Safe ( int r, int c, String word, int rowIncrement, int colIncrement){
      if (rowIncrement == 0 && colIncrement == 0) {
          return false;
      }
      int x = c;
      int y = r;
      for (int i = 0; i < word.length(); i++) {
          char letter = word.charAt(i);
          if (x > c || x < 0 || y > r || y < 0){
              return false;
          }
          if (data[x][y] != letter) {
              if (data[x][y] != '_'){
                  return false;
              }
          }
          x = x + colIncrement;
          y = y + rowIncrement;
      }
      return true;
  }