I am learning go and cgo and ffi, I have the header file below:

#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>

typedef struct MyStruct3 {
  const char *const *data;
  int length;
} MyStruct3;

void my_struct_3(const struct MyStruct3 *c_data);

And this go file

package main

/*
#cgo LDFLAGS: -L./release -lrust_ffi
#cgo CFLAGS: -I./target
#include <rust-ffi.h>
*/
import "C"
import (
    "fmt"
    "unsafe"
)

func main() {
    goStrings2 := []string{"Hello", "World", "from", "Go", "again"}

    // Convert Go slice to a C array of C strings
    cStrings2 := make([]*C.char, len(goStrings2))
    for i, s := range goStrings2 {
        cStrings2[i] = C.CString(s)
        defer C.free(unsafe.Pointer(cStrings2[i])) // Ensure we free the C string memory
    }

    cData := (**C.char)(unsafe.Pointer(&cStrings2[0]))
    cStruct3 := C.MyStruct3{
        data:   cData,
        length: C.int(len(goStrings2)),
    }

    C.my_struct_3((*C.struct_MyStruct3)(unsafe.Pointer(&cStruct3)))
}

I am getting the following error

panic: runtime error: cgo argument has Go pointer to unpinned Go pointer

goroutine 1 [running]:
main.main.func5(0x499ef3?)
    /helloworld-ffi/cgo/main.go:97 +0x30
main.main()
    /helloworld-ffi/cgo/main.go:97 +0x5e8
exit status 2

Any idea on how to solve this issue?

thank you very much