Validate IPv4 Address List

You are given an array of strings `addresses`. Return `true` if **every** string in the array is a valid IPv4 address; otherwise return `false`. An IPv4 address is valid if: - it contains exactly four parts separated by `.` - each part is non-empty and contains only decimal digits - each part represents a value from `0` to `255` - leading zeros are not allowed unless the part is exactly `0` Examples: - `['192.168.1.1', '8.8.8.8']` -> `true` - `['1.2.3.256']` -> `false` - `['01.2.3.4']` -> `false` - `['1..2.3']` -> `false` Aim for a solution that runs in linear time in the total number of characters across all strings.