Replace words in tweets: string replace?

I have tweets where “Elon Musk” is sometimes referred to as “elonmusk”, 'elonmusk’s", “elon” or “musk”.
How can I make the all to convert to ‘elon musk’?

I’m learning topic detection, in one topic I have both “elon” and “musk” weighted.

I’ve tried String manipulation but keep getting error message
many thanks for your help!

It seems you need to use replace() function not replaceChars()

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thank you, very much appreciated!