Task 4: sixfive

1. Multiples of 3 or 7 – Change the logic to print numbers that are multiples of 3 or 7 instead of 5 or 6.

2. Multiples of 30 – Modify the program to only print numbers that are both multiples of 5 AND 6 (multiples of 30).

3. Custom Separators – Update the separator string to include custom characters like @, #, or $.

4. Match Counter – Instead of printing the numbers, print the total count of how many matches were found in the file.

5. Standard Input Support – Modify sixfive to read from standard input (0) if no filename argument is provided.

6. Range Filter (10-100) – Implement a range filter to only print matching numbers that fall between 10 and 100.

7. Hexadecimal Output – Change the output format to print all identified numbers in hexadecimal.

8. Exclude Number 6 – Modify the code so that it never prints the number 6, even if it is a multiple of 6.

9. Sum Summary – Add a summary at the end of the output that prints the total sum of all numbers found.

10. Filename Header – Update the program to print the filename on the first line before listing the numbers found within.