fixed decoding input data for method, added test

Author: Alex Vlasov

web3swift/ABIv2/Classes/ABIv2Elements.swift

@@ -145,12 +145,12 @@ extension ABIv2.Element {
     func decodeInputData(_ rawData: Data) -> [String: Any]? {
         var data = rawData
         var sig: Data? = nil
-        switch rawData.count % 4 {
+        switch rawData.count % 32 {
         case 0:
             break
         case 4:
             sig = rawData[0 ..< 4]
-            data = rawData[4 ..< rawData.count]
+            data = Data(rawData[4 ..< rawData.count])
         default:
             return nil
         }

web3swiftTests/web3swiftTests.swift

@@ -2141,6 +2141,13 @@ class web3swiftTests: XCTestCase {
         }
     }
 
+    func testDecodeInputData() {
+        let contract = ContractV2.init(Web3.Utils.erc20ABI)!
+        let dataToDecode = Data.fromHex("0xa9059cbb000000000000000000000000cdd45864e794fe5e3e1b0045b77e62f4c43b8bd9000000000000000000000000000000000000000000000224b5f018c3e30142d5")!
+        let decoded = contract.decodeInputData("transfer", data: dataToDecode)
+        XCTAssert(decoded!["_to"] as? EthereumAddress == EthereumAddress("0xcdd45864e794fe5e3e1b0045b77e62f4c43b8bd9"))
+    }
+    
     func testPerformanceExample() {
         // This is an example of a performance test case.
         self.measure {