The solution has been encoded twice using 2 different methods

Firstly, from the challenge, the encoded text has been provided
MDEwMDAxMDAgMDAxMTAwMTEgMDEwMDAwMTEgMDAxMTAwMDAgMDExMDAxMDAgMDAxMTAwMTEgMDEwMTAwMTAgMDEwMTExMTEgMDEwMDExMDEgMDEwMDAwMDAgMDEwMTAwMTEgMDExMTAxMDAgMDAxMTAwMTEgMDEwMTAwMTA=

From here, we need to decode it using base64 that will show a set of binary
<img width="524" alt="image" src="https://github.com/lenebread/GiTxHextech-Challenge-Repo/assets/166520861/3c861c42-f147-4367-938c-be9e4e283939">

The last step to receive the flag will be by decoding the binary to receive the flag
<img width="764" alt="image" src="https://github.com/lenebread/GiTxHextech-Challenge-Repo/assets/166520861/4ccadf97-cb2a-4852-aeba-e1b4380994a5">

The flag is D3C0d3R_M@St3R