public boolean isSafe(char[][] board){
        for(int i = 0;i < board.length;i++){
            for(int j = 0;j < board[0].length;j++){
                if(board[i][j] == '.'){
                    if(i == 0 && j == 0){  // Bal felso sarok ellenorzese
                        if(board[i][j+1] != 'T' && board[i+1][j] != 'T'){
                            board[i][j] = '#';
                            return false;
                        }

                    }
                    else if(i == 0 && j == board[0].length - 1){  // Jobb felso sarok ellenorzese
                        if(board[i+1][j] != 'T' && board[i][j-1] != 'T'){
                            board[i][j] = '#';
                            return false;
                        }
                    }
                    else if(i == board.length - 1 && j == 0){  // Bal also sarok ellenorzese
                        if(board[i-1][j] != 'T' && board[i][j+1] != 'T'){
                            board[i][j] = '#';
                            return false;
                        }
                    }

                    else if(i == board.length - 1 && j == board[0].length - 1){  // Jobb also sarok ellenorzese
                        if(board[i-1][j] != 'T' && board[i][j-1] != 'T'){
                            board[i][j] = '#';
                            return false;
                        }
                    }

                    else if(i == 0 && (j != 0 && j != board[0].length - 1)){  //Elso sor ellenorzese
                        if(board[i][j-1] != 'T' && board[i][j+1] != 'T' && board[i+1][j] != 'T'){
                            board[i][j] = '#';
                            return false;
                        }
                    }

                    else if(i == board.length - 1 && (j != 0 && j != board[0].length - 1)){  //Utolso sor ellenorzese
                        if(board[i-1][j] != 'T' && board[i][j-1] != 'T' && board[i][j+1] != 'T'){
                            board[i][j] = '#';
                            return false;
                        }
                    }

                    else if(j == 0 && (i != 0 && i != board.length - 1)){  //Elso oszlop ellenorzese
                        if(board[i-1][j] != 'T' && board[i][j+1] != 'T' && board[i+1][j] != 'T'){
                            board[i][j] = '#';
                            return false;
                        }
                    }

                    else if(j == board[0].length - 1 && (i != 0 && i != board.length - 1)){  //Utolso oszlop ellenorzese
                        if(board[i-1][j] != 'T' && board[i][j-1] != 'T' && board[i+1][j] != 'T'){
                            board[i][j] = '#';
                            return false;
                        }
                    }
                    else{ //Az összes többi koordinata
                        if(board[i-1][j] != 'T' && board[i][j-1] != 'T' && board[i+1][j] != 'T' && board[i][j+1] != 'T'){
                            board[i][j] = '#';
                            return false;
                        }
                    }
                }
            }
        }
        return true;
    }