Swift AES Decryption 24 bytes

We are trying to encrypt an iOS swift project using this library: [login to view URL] The library works well with keys with 32 bytes but Is not working with 24 bytes which is a must for the acceptance criteria. I am looking for someone who can fix the following 2 methods. The code snippet is here : [login to view URL] Please create an Iphone project with Xcode 10.1 to test this code snippet and integrate the corresponding .h and .m files from the library.