⚡ Optimize extraction

.gas-snapshot

@@ -1,15 +1,15 @@
 IETest:testBalanceInERC20() (gas: 62541)
 IETest:testBalanceInETH() (gas: 53683)
-IETest:testCommandSendERC0() (gas: 115197)
-IETest:testCommandSendETH() (gas: 81697)
-IETest:testCommandSendUSDC() (gas: 147933)
-IETest:testDeploy() (gas: 1779435)
+IETest:testCommandSendERC0() (gas: 114684)
+IETest:testCommandSendETH() (gas: 81184)
+IETest:testCommandSendUSDC() (gas: 147420)
+IETest:testDeploy() (gas: 1772219)
 IETest:testENSNameFromENSHelper() (gas: 29125)
 IETest:testENSNameOwnership() (gas: 109154)
 IETest:testIENameSetting() (gas: 8174)
-IETest:testPreviewCommandSendDecimals() (gas: 113368)
-IETest:testPreviewCommandSendUSDC() (gas: 78237)
+IETest:testPreviewCommandSendDecimals() (gas: 112342)
+IETest:testPreviewCommandSendUSDC() (gas: 77724)
 IETest:testPreviewSend() (gas: 54699)
-IETest:testPreviewSendCommand() (gas: 67451)
+IETest:testPreviewSendCommand() (gas: 66938)
 IETest:testSendETH() (gas: 70975)
 IETest:testTotalSupply() (gas: 14810)

src/IE.sol

@@ -303,20 +303,19 @@ contract IE {
 
     /// @dev Extracts the first word from a string and returns it as a bytes32 (action).
     function _extraction(string memory normalizedIntent) internal pure returns (bytes32) {
-        bytes memory stringBytes = bytes(normalizedIntent);
-        uint256 endIndex = stringBytes.length;
-        for (uint256 i = 0; i < stringBytes.length; ++i) {
-            if (stringBytes[i] == 0x20) {
-                // ASCII space
-                endIndex = i;
-                break;
+        unchecked {
+            bytes memory stringBytes = bytes(normalizedIntent);
+            bytes32 result;
+            uint256 length = stringBytes.length > 32 ? 32 : stringBytes.length;
+            for (uint256 i; i != length; ++i) {
+                // Stop copying if a space is found.
+                if (stringBytes[i] == 0x20) {
+                    break;
+                }
+                result |= bytes32(stringBytes[i] & 0xFF) >> (i * 8);
             }
+            return result;
         }
-        bytes32 word;
-        for (uint256 i = 0; i < endIndex; ++i) {
-            word |= bytes32(stringBytes[i] & 0xFF) >> (i * 8);
-        }
-        return word;
     }
 
     /// @dev Extract key words of normalized `send` intent.