> you don't see C programmers creating shared libraries to determine if a number is odd, or to add whitespace to a string.

Believe me, if C had a way to seamlessly share libraries across architectures, OSes, and compiler versions, something similar would have happened.

Instead you get a situation where every reasonably big modern C project starts by implementing their own version of string libraries, dynamic arrays, maps (aka dictionaries), etc. Not much different really.