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// npm install viem

import { keccak256, toBytes, toFunctionSelector } from 'viem';

// Calculate function selector (4 bytes) from function signature
function getFunctionSelector(functionSignature: string): string {
  // Hash the function signature with keccak256
  const hash = keccak256(toBytes(functionSignature));

  // Take first 4 bytes (8 hex characters + 0x)