feat: address resolution function for hbarevm

ticket: win-8570

Author: rohitsaw115

modules/sdk-coin-evm/src/lib/utils.ts

@@ -272,3 +272,47 @@ export function validateHederaAccountId(address: string): { valid: boolean; erro
     error: null,
   };
 }
+
+/**
+ * Convert Hedera Account ID (e.g., 0.0.12345) to EVM address
+ */
+export async function resolveHederaAccountIdToEvmAddress(
+  accountId: string,
+  isProd: boolean
+): Promise<{ address: string | null; error?: string }> {
+  try {
+    const mirrorNodeUrl = isProd
+      ? 'https://mainnet-public.mirrornode.hedera.com'
+      : 'https://testnet.mirrornode.hedera.com';
+
+    const response = await fetch(`${mirrorNodeUrl}/api/v1/accounts/${accountId}`);
+
+    if (!response.ok) {
+      if (response.status === 404) {
+        return {
+          address: null,
+          error: 'Hedera Account ID not found. Please verify the account exists.',
+        };
+      }
+      return {
+        address: null,
+        error: `Failed to resolve Hedera Account ID: ${response.status}`,
+      };
+    }
+
+    const accountData = (await response.json()) as { evm_address?: string };
+    if (!accountData.evm_address) {
+      return {
+        address: null,
+        error: 'This Hedera account does not have an associated EVM address.',
+      };
+    }
+
+    return { address: accountData.evm_address };
+  } catch (error) {
+    return {
+      address: null,
+      error: 'Failed to resolve Hedera Account ID. Please check your connection.',
+    };
+  }
+}