declare your structure outside of the function.
Code:
#include <stdio.h>

typedef struct{
      int a, b, c;
   } test;

void func(test, test); // parameter name warning occurs here

int main()
{
   
   test here, there;

   //.........

   func(here, there);

   return 0;
}

void func(test here, test there) // parse error occurs here
{
   //........
}