Can an expert please help create a C$++$ code in matlab to help decrypt message

The following was encrypted by the Vigen$$re method. Find the plaintext.

ocwyikoooniwugpmxwktzdwgtssayjzwyemdlbnqaaavsuwdvbrflauplo oubfgqhgcscmgzlatoedcsdeidpbhtmuovpiekifpimfnoamvlpqfxejsm xmpgkccaykwfzpyuavtelwhrhmwkbbvgtguvtefjlodfefkvpxsgrsorvg tajbsauhzrzalkwuowhgedefnswmrciwcpaaavogpdnfpktdbalsisurln psjyeatcuceesohhdarkhwotikbroqrdfmzghgucebvgwcdqxgpbgqwlpb daylooqdmuhbdqgmyweuik

$($The ciphertext is stored under the name ocwy in the downloadable computer files $($bit$.1$y$/2$JbcS$6$p$).$ The plaintext is from The Adventure of the Dancing Men by Sir Arthur Conan Doyle.$)$