Rename bdk-kotlin companion project, fix gradle warnings

cc/bdk_ffi_test.c

@@ -0,0 +1,43 @@
+#include <assert.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include "bdk_ffi.h"
+
+int main (int argc, char const * const argv[])
+{   
+    char const * name = "test_wallet";
+    char const * desc = "wpkh([c258d2e4/84h/1h/0h]tpubDDYkZojQFQjht8Tm4jsS3iuEmKjTiEGjG6KnuFNKKJb5A6ZUCUZKdvLdSDWofKi4ToRCwb9poe1XdqfUnP4jaJjCB2Zwv11ZLgSbnZSNecE/0/*)";
+    char const * change = "wpkh([c258d2e4/84h/1h/0h]tpubDDYkZojQFQjht8Tm4jsS3iuEmKjTiEGjG6KnuFNKKJb5A6ZUCUZKdvLdSDWofKi4ToRCwb9poe1XdqfUnP4jaJjCB2Zwv11ZLgSbnZSNecE/1/*)";
+    
+    // test new_wallet
+    {
+        WalletPtr_t * wallet = new_wallet(name, desc, change);
+        assert(wallet != NULL);
+        
+        // test sync_wallet
+        sync_wallet(wallet);        
+        
+        // test new_address
+        char * address1 = new_address(wallet);
+        //printf("address1: %s\n", address1);       
+        assert( 0 == strcmp(address1,"tb1qgkhp034fyxeta00h0nne9tzfm0vsxq4prduzxp"));
+        free_string(address1);
+        
+        char * address2 = new_address(wallet);
+        //printf("address2: %s\n", address2);
+        assert(0 == strcmp(address2,"tb1qd6u9q327sru2ljvwzdtfrdg36sapax7udz97wf"));
+        free_string(address2);
+        
+        // test free_wallet
+        free_wallet(wallet);
+        
+        // test free_wallet NULL doesn't crash
+        free_wallet(NULL);
+        
+        // verify sync_wallet after sync_wallet fails (double free detected, core dumped)
+        ////sync_wallet(&wallet);
+    }
+        
+    return EXIT_SUCCESS;
+}