Function write_interval 

pub fn write_interval<W: Write>(
    writer: &mut W,
    items: Vec<(String, Option<String>)>,
    remaining: Option<usize>,
) -> Result

Writes a generic interval with proper alignment and optional remaining count.

Takes a vector of (address_string, optional_value_string) pairs where:

• address_string: The address as a string (not pre-padded)
• optional_value_string: Some(value) or None (prints “EMPTY”)
• remaining: Optional count of remaining items to show as “(N more items)”