Function is_hex_digits 

pub fn is_hex_digits(s: &str, length: usize) -> bool

Checks if a string contains exactly the specified number of hex digits.

This is a helper function for validating fixed-length hexadecimal strings like fingerprints and hashes.

Arguments

• s - The string to check
• length - The expected number of hex digits

Returns

true if the string has exactly length hexadecimal characters.

Example

use stem_rs::util::is_hex_digits;

assert!(is_hex_digits("abcd", 4));
assert!(is_hex_digits("ABCD1234", 8));
assert!(is_hex_digits("0123456789abcdef", 16));

assert!(!is_hex_digits("abcd", 5)); // Wrong length
assert!(!is_hex_digits("ghij", 4)); // Invalid hex chars