[fix]: P2SH test (#287)

<!-- enter the gh issue after hash -->

- [x] resolves
##243 (comment)
- [x] follows contribution
[guide](https://github.com/keep-starknet-strange/shinigami/blob/main/CONTRIBUTING.md)
- [x] code change includes tests

<!-- PR description below -->
Fixed failing P2SH test 4

packages/tests/src/tests/test_p2sh.cairo

@@ -66,8 +66,7 @@ fn test_p2sh_transaction_3() {
     assert!(res.is_ok(), "P2SH failed!:{:?}", res.unwrap_err());
 }
 
-// TODO: Fix this test
-#[ignore]
+
 #[test]
 fn test_p2sh_transaction_4() {
     //https://learnmeabitcoin.com/explorer/tx/cc11ca9e9dc188663c41eb23b15370f68eded56b7ec54dd5bc4f2d2ae93addb2
@@ -84,7 +83,7 @@ fn test_p2sh_transaction_4() {
 
     let utxo_hints = array![prev_out];
 
-    let res = validate_p2sh(@transaction, 0, utxo_hints, 0);
+    let res = validate_p2sh(@transaction, 1, utxo_hints, 0);
     assert!(res.is_ok(), "P2SH failed!:{:?}", res.unwrap_err());
 }
 

packages/tests/src/validate.cairo

@@ -164,7 +164,23 @@ pub fn validate_p2sh(
     let mut redeem_script_size = 0;
     if scriptSig_bytes[0] == 0 || scriptSig_bytes[0] == 1 || scriptSig_bytes[0] == 2 {
         //OP_0 OP_PushData <Sig> OP_PushData <RedeemScript>  Standard locking scripts
-        redeem_Script_start_index = (2 + scriptSig_bytes[1] + 1).into();
+        if (flags == 0) {
+            redeem_Script_start_index = (2 + scriptSig_bytes[1] + 1).into();
+        } else if (flags == 1) {
+            redeem_Script_start_index =
+                (1
+                    + 1
+                    + scriptSig_bytes[1]
+                    + 1
+                    + scriptSig_bytes[(1 + 1 + scriptSig_bytes[1]).into()]
+                    + scriptSig_bytes[(1
+                        + 1
+                        + scriptSig_bytes[1]
+                        + scriptSig_bytes[(1 + 1 + scriptSig_bytes[1]).into()])
+                        .into()]
+                    + 1)
+                .into();
+        }
         redeem_script_size = (scriptSig_bytes.len()) - redeem_Script_start_index;
     } else {
         // non-standard locking script containing a mathematical puzzle