Simplify test code for CBR sample

try(BufferedReader br = new BufferedReader(new FileReader(path))) {
    		
    	    StringBuilder sb = new StringBuilder();
    	    String line = br.readLine();

    	    while (line != null) {
    	        sb.append(line);
    	        sb.append(System.lineSeparator());
    	        line = br.readLine();
    	    }
    	    
    	    String everything = sb.toString();
    	    return everything;
    	}

    	Path filePath = new File(path).toPath();
	return new String(Files.readAllBytes(filePath), StandardCharsets.UTF_8);