exposing json

WIP fix for removing templates

Removing templates part 1

replacing core/constants.h

removed template part 2

Changed fake data to filler data

Fixing CI

Fix CI part 2

CI fix part 2

Fix CI 3

Fixed lizard for data_util

Fixed clang

Fixing CI part 4

fix review cmts

fix ci

fix Ci

fixci

address ci

ci

- add timeout
- add more test cases

fix CI

address review cmts