cipher text file names as arguments. It reads the clear text files, generates a random key, performs XOR on clear text and random key, producing the cipher text, and writes the random key and cipher text to file. When using malloc(), make sure to add 1 to the length of the string for the null char. Also, make sure to free() any allocated memory before the function returns. Sample function call for encrypt(): encrypt(clear_file, key_file, cipher_file); // Where the three arguments are strings containing filenames. The decrypt() function accepts the random key, cipher text and cipher text file names as arguments. It reads the random key and cipher text files. Read the random key and the cypher text using read_file. Sample function for decrypt(): decrypt(key_file, cipher_file, message_file); // Where the three arguments are strings containing filenames. Note: You must check if memory is successfully allocated and that files are opened successfully before using pointers to these objects. If a memory allocation or file open is unsuccessful, the pointer
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will be NULL. If a NULL pointer is found, you should provide an appropriate error message and terminate the program. You can test that the open file check works by passing a filename that does not exist.
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