/usr/share/doc/libnanohttp-dev/TODO is in libnanohttp-dev 1.1.0-17.2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libnanohttp-dev/../libnanohttp1/TODO
/usr/share/doc/libnanohttp-dev/../libnanohttp1/TODO