String.prototype.normalizeadvancedconst e1 = 'Γ©' // Γ© precomposed
const e2 = 'eΜ' // e + combining accent
e2.normalize('NFC') === e1 // β trueUse normalize() to convert a string to a Unicode normal form, useful for comparing visually identical strings.
NFKD (Compatibility Decomposition): like NFD but also decomposes compatibility characters.
Challenge: Implement toNFKD(str) using .normalize('NFKD').