Concatenate two strings with a space in between. If either string is null, treat it as an empty string.
Examples:
Input: first = 'Hello', second = 'World'
Output: 'Hello World'
Explanation: Both strings are concatenated with a space
Input: first = null, second = 'World'
Output: ' World'
Explanation: Null first string treated as empty, space added before second string
Input: first = 'Hello', second = null
Output: 'Hello '
Explanation: Null second string treated as empty, space added after first string
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