See C Plus Plus Templates and see the book C++ Templates - The Complete Guide, by David Vandevoorde, Nicolai Josuttis, Douglas Gregor

• Are there templates used in the C Language
• https://stackoverflow.com/questions/14746425/are-there-templates-in-the-c-programming-language

Templates are a feature of the C++ programming language that allow functions and classes to operate with generic types.

C has no templates like C++, though you can achieve something similar with “clever” use of #define macros.