There are a many approaches to implementing OOP in C. Since C doesn’t give you any language constructs to implement this out of the box, it’s up to you to do it in a consistent and understandable manner. Since there is no definite way to do it, let me just give you an example of how I would translate a Python file, and you can decide how you implement it from there:

--------------
class Parent:
    def __init__(self, param1: str, param2: int):
        self.__param1 = param1
        self.__param2 = param2
    def __private_method(self):
        print("private method")
    def public_method(self):
        print("public method")
    @staticmethod
    def static_method():
        print("static method")
    @property
    def param1(self):
        return self.__param1

class Child(Parent):
    def __init__(self):
        super().__init__("param1", 2)
--------------

I would split the C code for this into header and source files:

(header.h)

--------------
#pragma once

/// Parent Class ///
typedef struct Parent_obj {
    char* param1
    unsigned int param1_len
    int param2
} Parent_obj_t;
void Parent_init(Parent_obj_t* self, char* param1, unsigned int param1_len, int param2);
void Parent_public_method(Parent_obj_t* self);
void Parent_static_method();
void Parent_param1(Parent_obj_t* self, char* out, unsigned int max_len); // property method with upper bound string length
void Parent_del(Parent_obj_t* self); // destruct object (similar to __del__() in python)

/// Child Class ///
typedef struct Child_obj {
    Parent_hidden_state_t* super
    char* param
    unsigned int param_len
} Child_obj_t
void Child_init(Child_obj_t* self, Parent_obj_t* super);
void Child_del(Child_obj_t* self);
--------------

(source.c)

--------------
#include "header.h"

/// Parent Class ///
// private methods
void Parent_private_method(Parent_obj_t* self){...} // not visible in the header file
// public methods
void Parent_init(Parent_obj_t* self, char* param1, unsigned int param1_len, int param2){...}
void Parent_public_method(Parent_obj_t* self){...}
void Parent_static_method(){...}
void Parent_param1(Parent_obj_t* self, char* out, unsigned int max_len){...}
void Parent_del(Parent_obj_t* self){...}

/// Child Class ///
// public methods
void Child_init(Child_obj_t* self, Parent_obj_t* super){...}
void Child_del(Child_obj_t* self){...}
--------------

Modules and namespaces can be modeled using folders and prefixing your structs and functions.