Function normalize_mnemonic 

pub fn normalize_mnemonic(input: &str) -> String

Normalizes a mnemonic string by replacing commas or multiple whitespace with single spaces.

This handles various input formats:

• Comma-separated words: “word1,word2,word3”
• Whitespace-separated words: “word1 word2\tword3”
• Mixed separators: “word1, word2 word3”

Examples

use mx_core::normalize_mnemonic;

let mnemonic = "abandon,abandon abandon  about";
assert_eq!(normalize_mnemonic(mnemonic), "abandon abandon abandon about");