20250123.00

Pass c-strings to logging functions (#140)

Passing a string to a variadic function can fail at runtime, and
results in the following error when compiling with clang++:
`error: cannot pass object of non-trivial type 'string' (aka 'basic_string<char>') through variadic function; call will abort at runtime`

This fixes the issue by passing c-strings to the relevant functions
instead of string.