Function normalizeMac

normalizeMac(mac: string): string
Normalizes a MAC address by removing separators and converting to lowercase. Accepts formats: AA:BB:CC:DD:EE:FF, AA-BB-CC-DD-EE-FF, AABBCCDDEEFF
Parameters
- mac: string
  MAC address in any common format
Returns string
Normalized MAC address (12 lowercase hex chars, no separators)
Throws
Error if MAC address format is invalid
Example
```
normalizeMac("AA:BB:CC:DD:EE:FF") // returns "aabbccddeeff"
normalizeMac("AA-BB-CC-DD-EE-FF") // returns "aabbccddeeff"
normalizeMac("AABBCCDDEEFF")      // returns "aabbccddeeff"
```
- Defined in mac-utils.ts:14