I need a c++ code that:

1- Read from a text file using C++ example: mytext.txt

2- a function that adds three letters to each latter in that text file

for example, if there is a "hello world" inside the text file

the function will make it look like "habcezyeloiulghtoiuy wnfroewqrmnilkitduyt" if you note the first latter h follow with three letters abc the e follow with another three zye .... etc

so the function is like hashing function that adds for each latter another three letters. print the hashing in this function in main.

3- a function that gives me the solution for the first function and prints the solve for the hashing which is the info inside the text file in the main.

example: hello" h---e---l---l---o--- print h then delete the other three letters then print e then delete the other three letters ...etc at final it will look like original word inside the text file "hello".

the text file could include sentences no limit.