create separate lib for token portal content hash

docs/docs/dev_docs/contracts/portals/main.md

@@ -50,7 +50,8 @@ Computing the `content` must be done manually in its current form, as we are sti
 :::info
 The `content_hash` is a sha256 truncated to a field element (~ 254 bits). In Aztec-nr, you can use our `sha256_to_field()` to do a sha256 hash which fits in one field element:
 
-#include_code mint_public_content_hash_nr /yarn-project/noir-contracts/src/contracts/token_bridge_contract/src/util.nr rust
+#include_code mint_public_content_hash_nr /yarn-project/noir-contracts/src/contracts/token_portal_content_hash_lib/src/lib.nr rust
+
 
 In solidity, you can use our `Hash.sha256ToField()` method:
 

yarn-project/noir-contracts/src/contracts/test_contract/Nargo.toml

@@ -6,3 +6,4 @@ type = "contract"
 
 [dependencies]
 aztec = { path = "../../../../aztec-nr/aztec" }
+token_portal_content_hash_lib = { path = "../token_portal_content_hash_lib" }

yarn-project/noir-contracts/src/contracts/test_contract/src/main.nr

@@ -1,5 +1,3 @@
-mod utils;
-
 // A contract used for testing a random hodgepodge of small features from simulator and end-to-end tests.
 contract Test {
     use dep::aztec::{
@@ -15,7 +13,7 @@ contract Test {
         types::vec::BoundedVec,
         constants_gen::EMPTY_NULLIFIED_COMMITMENT,
     };
-    use crate::utils::{get_mint_private_content_hash, get_mint_public_content_hash};
+    use dep::token_portal_content_hash_lib::{get_mint_private_content_hash, get_mint_public_content_hash};
 
     #[event]
     struct ExampleEvent {

yarn-project/noir-contracts/src/contracts/token_bridge_contract/Nargo.toml

@@ -5,4 +5,5 @@ compiler_version = "0.1"
 type = "contract"
 
 [dependencies]
-aztec = { path = "../../../../aztec-nr/aztec" }
+aztec = { path = "../../../../aztec-nr/aztec" }
+token_portal_content_hash_lib = { path = "../token_portal_content_hash_lib" }

yarn-project/noir-contracts/src/contracts/token_bridge_contract/src/main.nr

@@ -1,4 +1,3 @@
-mod util;
 mod token_interface;
 
 // Minimal implementation of the token bridge that can move funds between L1 <> L2.
@@ -17,9 +16,9 @@ contract TokenBridge {
         types::address::{AztecAddress, EthereumAddress},
         selector::compute_selector,
     };
+    use dep::token_portal_content_hash_lib::{get_mint_public_content_hash, get_mint_private_content_hash, get_withdraw_content_hash};
 
     use crate::token_interface::Token;
-    use crate::util::{get_mint_public_content_hash, get_mint_private_content_hash, get_withdraw_content_hash};
 
     // Storage structure, containing all storage, and specifying what slots they use.
     struct Storage {

yarn-project/noir-contracts/src/contracts/token_portal_content_hash_lib/Nargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "token_portal_content_hash_lib"
+authors = ["aztec-labs"]
+compiler_version = "0.1"
+type = "lib"
+
+[dependencies]
+aztec = { path = "../../../../aztec-nr/aztec" }