Fix not-null terminated string print within C template

[haixuanTao]

C Node Template used to read the ID string that was not null terminated making it read non UTF8 strings,

This fixes this issue by using the id_len to define the string.

Before

[c node] dora context initialized
I heard Hello World from speech-2 at 7413312390293631648
I heard Hello World from speech-1� at 7413312390293852048
I heard Hello World from speech-1rld at 7413312390724241040
I heard Hello World from speech-1 at 7413312391153242512
I heard Hello World from speech-1rld at 7413312391583614704
I heard Hello World from speech-1 at 7413312392013829936
I heard Hello World from speech-1 at 7413312392445357008
I heard Hello World from speech-1 at 7413312392869967824
I heard Hello World from speech-1 at 7413312393300188464
I heard Hello World from speech-1 at 7413312393728743248
I heard Hello World from speech-1 at 7413312394163419488
[c node] received input closed event
I heard Hello World from speech-2 at 7413312398882741200
[c node] received stop event

After

[c node] dora context initialized
I heard Hello World from speech-2 at 7413314362653395744
I heard Hello World from speech-1 at 7413314362653612304
I heard Hello World from speech-1 at 7413314363085816864
I heard Hello World from speech-1 at 7413314363514843808
I heard Hello World from speech-1 at 7413314363944633504
I heard Hello World from speech-1 at 7413314364373638000
I heard Hello World from speech-1 at 7413314364802237744
I heard Hello World from speech-1 at 7413314365230875824
I heard Hello World from speech-1 at 7413314365659380208
I heard Hello World from speech-1 at 7413314366092720496
I heard Hello World from speech-1 at 7413314366519381008
[c node] received input closed event
[c node] received stop event