Twinkle | : sparkles : Twinkle iOS/tvOS app elements in Swift | iOS library

I need to write function which given a text file object open in read and write mode and a string, inserts the text of the string in the file at the current read/write position. In other words, the function writes the string in the file without overwriting the rest of it. When exiting the function, the new read/write position has to be exactly at the end of the newly inserted string. The algorithm is simple; the function needs to:

1. read the content of the file starting at the current read/write position
2. write the given string at the same position step 1 started
3. write the content read at step 1. at the position where step 2. ended
4. reposition the read/write cursor at the same position step2. ended (and step 3. started)

If the argument file object is not readable or writable, the function should print a message and return immediately without changing anything. This can be achieved by using the methods file object methods readable() and writable().

In the main script:

1- prompt the user for a filename

2- open the file in read-write mode. If the file is not found, print a message and exit the program

3- insert the filename as the first line of the file followed by an empty line

4- insert a line number and a space, at the beginning of each line of the original text.

I'm very confused on how to write the function and main body. so far I only have

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Question
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Code

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