Please write a code for removing special characters and spaces in c++. Below is the text.

"Cipher block chaining (CBC) is a mode of operation for a block cipher (one in which a sequence

of bits are encrypted as a single unit or block with a cipher key applied to the entire block).

Cipher block chaining uses what is known as an initialization vector (IV) of a certain length.

One of its key characteristics is that it uses a chaining mechanism that causes the decryption

of a block of ciphertext to depend on all the preceding ciphertext blocks.

As a result, the entire validity of all preceding blocks is contained in the

immediately previous ciphertext block. A single bit error in a ciphertext block affects

the decryption of all subsequent blocks. Rearrangement of the order of the ciphertext

blocks causes decryption to become corrupted"