1. The description said rail fence, so I considered it to use rail fence cipher.
2. There is no "cbmctf" pattern in the easy_cipher, so I guessed it was encoded.
3. I took this [website](https://www.geeksforgeeks.org/rail-fence-cipher-encryption-decryption) as reference and wrote code to bruteforce.

[code](https://github.com/HardworkingSnowman/CTF/blob/master/CRYPTO/cbmCTF/Easy_cipher/sol.py)