⚡ Optimize split

.gas-snapshot

@@ -1,15 +1,15 @@
 IETest:testBalanceInERC20() (gas: 62541)
 IETest:testBalanceInETH() (gas: 53683)
-IETest:testCommandSendERC0() (gas: 117712)
-IETest:testCommandSendETH() (gas: 83838)
-IETest:testCommandSendUSDC() (gas: 150633)
-IETest:testDeploy() (gas: 1799284)
+IETest:testCommandSendERC0() (gas: 115797)
+IETest:testCommandSendETH() (gas: 82297)
+IETest:testCommandSendUSDC() (gas: 148533)
+IETest:testDeploy() (gas: 1806509)
 IETest:testENSNameFromENSHelper() (gas: 29125)
 IETest:testENSNameOwnership() (gas: 109154)
 IETest:testIENameSetting() (gas: 8174)
-IETest:testPreviewCommandSendDecimals() (gas: 120253)
-IETest:testPreviewCommandSendUSDC() (gas: 80750)
+IETest:testPreviewCommandSendDecimals() (gas: 114569)
+IETest:testPreviewCommandSendUSDC() (gas: 78837)
 IETest:testPreviewSend() (gas: 54699)
-IETest:testPreviewSendCommand() (gas: 70150)
+IETest:testPreviewSendCommand() (gas: 68051)
 IETest:testSendETH() (gas: 70975)
 IETest:testTotalSupply() (gas: 14810)

src/IE.sol

@@ -348,14 +348,16 @@ contract IE {
             }
             string[] memory parts = new string[](count);
             uint256 partIndex;
-            bytes memory tempPart;
+            uint256 start;
             for (uint256 i; i <= baseBytes.length; ++i) {
                 if (i == baseBytes.length || baseBytes[i] == delimiter) {
-                    parts[partIndex] = string(tempPart);
+                    bytes memory part = new bytes(i - start);
+                    for (uint256 j = start; j != i; ++j) {
+                        part[j - start] = baseBytes[j];
+                    }
+                    parts[partIndex] = string(part);
                     ++partIndex;
-                    tempPart = "";
-                } else {
-                    tempPart = abi.encodePacked(tempPart, baseBytes[i]);
+                    start = i + 1;
                 }
             }
             return parts;