|C/C++| Use dlopen and dlsym to get handler of dynamic library(.so)

If you have a dynamic library (libtest.so) and there is a function (int test_foo(float)) in this library, how can I reuse the function in another library?

#include <stdio.h>
#include <stdlib.h>
#include <dlfcn.h>

int main(int argc, char **argv)
{
   void     *handle;
   
   // An function pointer, for point to test_foo
   int   (*test_foo_pointer)(float);
   char     *error;

   //open the target library libtest.so
   handle = dlopen("libtest.so", RTLD_LAZY);
   if (!handle) {
       fprintf(stderr, "%s\n", dlerror());
       exit(EXIT_FAILURE);
   }

   dlerror();    // Clear any existing error


   // get test_foo and assign to test_foo_pointer 
   test_foo_pointer = dlsym(handle, "test_foo");
   
   if ((error = dlerror()) != NULL)  {
       fprintf(stderr, "%s\n", error);
       exit(EXIT_FAILURE);
   }

   dlclose(handle);
   exit(EXIT_SUCCESS);
}