Fix the log format.

samples/kvdb_basic_sample.c

@@ -23,6 +23,8 @@ void kvdb_basic_sample(fdb_kvdb_t kvdb)
     struct fdb_blob blob;
     int boot_count = 0;
 
+    FDB_INFO("==================== kvdb_basic_sample ====================\n");
+
     { /* GET the KV value */
         /* get the "boot_count" KV value */
         fdb_kv_get_blob(kvdb, "boot_count", fdb_blob_make(&blob, &boot_count, sizeof(boot_count)));
@@ -41,6 +43,8 @@ void kvdb_basic_sample(fdb_kvdb_t kvdb)
         fdb_kv_set_blob(kvdb, "boot_count", fdb_blob_make(&blob, &boot_count, sizeof(boot_count)));
         FDB_INFO("set the 'boot_count' value to %d\n", boot_count);
     }
+
+    FDB_INFO("===========================================================\n");
 }
 
 #endif /* FDB_USING_KVDB */

samples/kvdb_type_blob_sample.c

@@ -21,6 +21,8 @@ void kvdb_type_blob_sample(fdb_kvdb_t kvdb)
 {
     struct fdb_blob blob;
 
+    FDB_INFO("==================== kvdb_type_blob_sample ====================\n");
+
     { /* CREATE new Key-Value */
         int temp_data = 36;
 
@@ -54,6 +56,8 @@ void kvdb_type_blob_sample(fdb_kvdb_t kvdb)
         fdb_kv_del(kvdb, "temp");
         FDB_INFO("delete the 'temp' finish\n");
     }
+
+    FDB_INFO("===========================================================\n");
 }
 
 #endif /* FDB_USING_KVDB */

samples/kvdb_type_string_sample.c

@@ -20,6 +20,8 @@
 
 void kvdb_type_string_sample(fdb_kvdb_t kvdb)
 {
+
+    FDB_INFO("==================== kvdb_type_string_sample ====================\n");
     { /* CREATE new Key-Value */
         char temp_data[10] = "36C";
 
@@ -54,6 +56,8 @@ void kvdb_type_string_sample(fdb_kvdb_t kvdb)
         fdb_kv_del(kvdb, "temp");
         FDB_INFO("delete the 'temp' finish\n");
     }
+
+    FDB_INFO("===========================================================\n");
 }
 
 #endif /* FDB_USING_KVDB */

samples/tsdb_sample.c

@@ -32,6 +32,8 @@ void tsdb_sample(fdb_tsdb_t tsdb)
 {
     struct fdb_blob blob;
 
+    FDB_INFO("==================== tsdb_sample ====================\n");
+
     { /* APPEND new TSL (time series log) */
         struct env_status status;
 
@@ -74,6 +76,8 @@ void tsdb_sample(fdb_tsdb_t tsdb)
          */
         fdb_tsl_iter(tsdb, set_status_cb, tsdb);
     }
+
+    FDB_INFO("===========================================================\n");
 }
 
 static bool query_cb(fdb_tsl_t tsl, void *arg)