You've just finished writing the last chapter for your novel when a virus suddenly infects your document. It has swapped the 'i's and 'e's in 'ei' words and capitalized random letters. In today's challenge, you will write a function which will:
a) remove the spelling errors in 'ei' words. (Example of 'ei' words: their, caffeine, deceive, weight)
b) only capitalise the first letter of each sentence. Make sure the rest of the sentence is in lower case.
Example: He haD iEght ShOTs of CAffIEne. => He had eight shots of caffeine.
Good luck and Happy Coding~!
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