fix error hex version

Author: HaoXuan40404

ffi/ffi_c/ffi_c_vcl/src/lib.rs

@@ -279,7 +279,7 @@ pub extern "C" fn wedpr_vcl_verify_product_balance(
                 FAILURE
             ));
 
-        let result = match wedpr_s_verifiable_confidential_ledger::vcl::verify_sum_balance(
+        let result = match wedpr_s_verifiable_confidential_ledger::vcl::verify_product_balance(
             &c1_credit, &c2_credit, &c3_credit, &proof,
         ) {
             Ok(v) => v,
@@ -376,7 +376,7 @@ pub extern "C" fn wedpr_vcl_prove_range(
 
         let proof =
             wedpr_s_verifiable_confidential_ledger::vcl::prove_range(&secret);
-        c_safe_string_to_c_char_pointer!(proof)
+        c_safe_string_to_c_char_pointer!(bytes_to_string(&proof))
     });
     c_safe_return!(result)
 }

solution/key_tool_box/hierarchical_deterministic_key/Cargo.toml

@@ -9,10 +9,10 @@ description = "Library of Hierarchical Deterministic Key (HDK) solution."
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-hex = "0.3"
+hex = "0.4.2"
 rand = "0.7"
 hdk_ext_model = { package = "h-wagyu-model", version = "0.6.3" }
-hdk_ext_lib = { package = "wagyu-hdk", version = "0.6.4" }
+hdk_ext_lib = { package = "wagyu-hdk", version = "0.6.3" }
 wedpr_l_macros = "1.0.0"
 wedpr_l_utils = "1.0.0"