starknet_api: implement TryFrom from StarknetVersion into Felt

Author: Yoni-Starkware

crates/starknet_api/src/block.rs

@@ -14,6 +14,7 @@ use strum_macros::EnumIter;
 use time::OffsetDateTime;
 
 use crate::core::{
+    ascii_as_felt,
     ContractAddress,
     EventCommitment,
     GlobalRoot,
@@ -162,6 +163,14 @@ impl TryFrom<&str> for StarknetVersion {
     }
 }
 
+impl TryFrom<&StarknetVersion> for Felt {
+    type Error = StarknetApiError;
+
+    fn try_from(starknet_version: &StarknetVersion) -> Result<Self, Self::Error> {
+        ascii_as_felt(&starknet_version.to_string())
+    }
+}
+
 impl Serialize for StarknetVersion {
     fn serialize<S>(
         &self,

crates/starknet_api/src/block_hash/block_hash_calculator.rs

@@ -161,7 +161,7 @@ pub fn calculate_block_hash(
                 .iter(),
             )
             .chain(
-                &ascii_as_felt(&partial_block_hash_components.starknet_version.to_string())
+                &Felt::try_from(&partial_block_hash_components.starknet_version)
                     .expect("Expect ASCII version"),
             )
             .chain(&Felt::ZERO)

crates/starknet_os/src/hints/hint_implementation/block_hash/test.rs

@@ -24,7 +24,6 @@ use starknet_api::block_hash::block_hash_calculator::{
     STARKNET_GAS_PRICES0,
 };
 use starknet_api::core::{
-    ascii_as_felt,
     EventCommitment,
     GlobalRoot,
     ReceiptCommitment,
@@ -111,7 +110,7 @@ fn cairo_calculate_block_hash(
         EndpointArg::from(gas_prices_hash),
         EndpointArg::from(state_root),
         EndpointArg::from(parent_hash),
-        EndpointArg::from(ascii_as_felt(&components.starknet_version.to_string()).unwrap()),
+        EndpointArg::from(Felt::try_from(&components.starknet_version).unwrap()),
     ];
 
     // We expect one felt as return value (block_hash).