nip54 normalizeIdentifier function

nip54.ts

@@ -0,0 +1,19 @@
+export function normalizeIdentifier(name: string): string {
+  // Trim and lowercase
+  name = name.trim().toLowerCase()
+
+  // Normalize Unicode to NFKC form
+  name = name.normalize('NFKC')
+
+  // Convert to array of characters and map each one
+  return Array.from(name)
+    .map(char => {
+      // Check if character is letter or number using Unicode ranges
+      if (/\p{Letter}/u.test(char) || /\p{Number}/u.test(char)) {
+        return char
+      }
+
+      return '-'
+    })
+    .join('')
+}