[Leetcode] 2325. Decode the Message

https://leetcode.com/problems/decode-the-message

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class Solution:
    def decodeMessage(self, key: str, message: str) -> str:
        key = key.replace(' ', '')
        table = {}
        
        index = 0
        for n in key:
            if n == ' ':
                continue
            if table.get(n, None) is None:
                table[n] = chr(97 + index)
                index += 1

        result = ''
        for i in message:
            if i == ' ':
                result += i
            else:
                result += table[i]

        return result