Write a program that takes a string of characters (including spaces) as input, computes the frequency of each character, sorts them by frequency, and outputs the Huffman code for each character. Use the sentence above as input. When you are writing your program, you should first test it on a string of 7 characters, so you can check it. PLEASE NOTE: Your program must work for any text that has upper and lower case letters digits 0 - 9, commas, periods, and spaces. Please submit the source code (cpp) file in standard C++ as one file. Then upload a screenshot of the output as another file.