Coding Quiz - Find the First Non-repeating Character

In this coding quiz, you will write a function to find the first non-repeating character in an array of strings using a hash table.

For instance, given the character array ['a', 'b', 'c', 'a', 'c'], the function should return b.

If all characters are repeated, return None.

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def solution(char_array):
    # Write your code here
    return

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• The character array consists only of lowercase English letters.

• The array size is at least 1.

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• Input: ['a', 'b', 'c', 'a', 'c']
• Output: 'b'

• Input: ['x', 'y', 'y', 'z', 'z', 'x']
• Output: None