Function human_bytes 

pub fn human_bytes(n: u64) -> String

What: Format a byte count using binary units with one decimal place.

Inputs:

• n: Raw byte count to format

Output:

• Size string such as “1.5 KiB” using 1024-based units.

Details:

• Iteratively divides by 1024 up to PiB, retaining one decimal place for readability.
• Always shows decimal place (unlike format_bytes which shows integer for bytes < 1024).