package iskra

import "bytes"

// NormalizeCode lowercases and trims a code token for hashing.
// Strips leading/trailing whitespace. Preserves underscores and digits.
func NormalizeCode(token string) []byte {
	trimmed := bytes.TrimSpace([]byte(token))
	b := []byte{:len(trimmed)}
	copy(b, trimmed)
	for i := 0; i < len(b); i++ {
		c := b[i]
		if c >= 'A' && c <= 'Z' {
			b[i] = c + 32
		}
	}
	return b
}