c programming

Implement a function (using only #include ) that can encrypt/decrypt a string using a caesar cipher, in where the blank spaces remain blank spaces when using the cipher.

caesar_cipher(string, result, key, stat)

string - the input string that will be encrypted/decrypted

result - a string that will have the result of the encryption/decryption

key - key of the caesar cipher (which is an integer); can be positive or negative

stat - an integer where we either pass two constants, ENCRYPT or DECRYPT

**Hint: build a helper string with "ABC..Z" w/o the blank space