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Convert Hexadecimal to Dotted IPv4

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Problem statement

Convert a 32-bit IPv4 address written as exactly eight hexadecimal digits into dotted-decimal notation. An optional leading 0x or 0X is allowed and hex letters are case-insensitive.

Interpret the first byte as the first decimal octet. Return INVALID for any other length or character.

Function

hexToIpv4(value: String) → String

Examples

Example 1

value = "C0A80101"return = "192.168.1.1"

The four bytes C0, A8, 01, and 01 become the four octets.

Example 2

value = "0x7F000001"return = "127.0.0.1"

The optional prefix is removed before byte conversion.

Example 3

value = "ABC"return = "INVALID"

The payload must contain exactly eight hexadecimal digits.

Constraints

0 <= value.length <= 20.
The result must use ordinary decimal octets without leading zeros.