Cyber Apocalypse CTF 2025: Exploiting Rounding Errors in HeliosDEX

One of the blockchain challenges in Cyber Apocalypse CTF had the Solidity contract called HeliosDEX, a Solidity-based decentralized exchange allowing swaps of Ether for three ERC20 tokens (ELD, MAL, HLS) and a one-time refund of tokens for Ether. Loo...