A basic solidity router caller, which calls an exchange router and it gets its WETH address.
The example file is deployed on the BSC Testnet on the 0xdcD561eEa80210C5ac2ADCE3c173a537d1Baf7FC address, calling the https://kiemtienonline360.github.io/bsc-swap-simulation/ pancake exchange simulator router at 0x9Ac64Cc6e4415144C455BD8E4837Fea55603e5c3.