Find Maximum XOR Substring

Write a function that finds the maximum XOR value of any two substrings of a given string of numbers.
        
       Input:-1, 2, 3, 4
       Input Description: Input a string of numbers. 
       Output: 7
       Output Description: Output the maximum XOR value. 
       Constraints: 1 <= string length <= 10^6
       Explanation:

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