dev: Precompiles -> Cairo1Helpers (#1057)

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## What is the current behavior?

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Resolves #<Issue number>

## What is the new behavior?

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kakarot_scripts/constants.py

@@ -177,7 +177,7 @@ class ArtifactType(Enum):
     {"contract_name": "uninitialized_account", "cairo_version": ArtifactType.cairo0},
     {"contract_name": "EVM", "cairo_version": ArtifactType.cairo0},
     {"contract_name": "OpenzeppelinAccount", "cairo_version": ArtifactType.cairo0},
-    {"contract_name": "Precompiles", "cairo_version": ArtifactType.cairo1},
+    {"contract_name": "Cairo1Helpers", "cairo_version": ArtifactType.cairo1},
     {"contract_name": "replace_class", "cairo_version": ArtifactType.cairo0},
 ]
 

kakarot_scripts/deploy_kakarot.py

@@ -58,7 +58,7 @@ async def main():
             ETH_TOKEN_ADDRESS,  # native_token_address_
             class_hash["account_contract"],  # account_contract_class_hash_
             class_hash["uninitialized_account"],  # uninitialized_account_class_hash_
-            class_hash["Precompiles"],
+            class_hash["Cairo1Helpers"],
             BLOCK_GAS_LIMIT,
         )
 
@@ -68,7 +68,7 @@ async def main():
             ETH_TOKEN_ADDRESS,  # native_token_address_
             class_hash["account_contract"],  # account_contract_class_hash_
             class_hash["uninitialized_account"],  # uninitialized_account_class_hash_
-            class_hash["Precompiles"],
+            class_hash["Cairo1Helpers"],
             BLOCK_GAS_LIMIT,
         )
 

src/kakarot/interfaces/interfaces.cairo

@@ -139,9 +139,14 @@ namespace IKakarot {
 }
 
 @contract_interface
-namespace IPrecompiles {
+namespace ICairo1Helpers {
     func exec_precompile(address: felt, data_len: felt, data: felt*) -> (
         success: felt, gas: felt, return_data_len: felt, return_data: felt*
     ) {
     }
+
+    func keccak(
+        words_len: felt, words: felt*, last_input_word: felt, last_input_num_bytes: felt
+    ) -> (hash: Uint256) {
+    }
 }

src/kakarot/precompiles/precompiles.cairo

@@ -6,7 +6,7 @@ from starkware.starknet.common.syscalls import library_call
 from starkware.cairo.common.alloc import alloc
 from starkware.cairo.common.memcpy import memcpy
 
-from kakarot.interfaces.interfaces import IPrecompiles
+from kakarot.interfaces.interfaces import ICairo1Helpers
 from kakarot.storages import Kakarot_precompiles_class_hash
 from kakarot.errors import Errors
 from kakarot.precompiles.blake2f import PrecompileBlake2f
@@ -130,7 +130,7 @@ namespace Precompiles {
         memcpy(calldata + 2, input, input_len);
         let (
             success, gas, return_data_len, return_data
-        ) = IPrecompiles.library_call_exec_precompile(
+        ) = ICairo1Helpers.library_call_exec_precompile(
             class_hash=implementation, address=evm_address, data_len=input_len, data=input
         );