Question: Let's write python code! Part 1 : Substring Search Write a function that searches a string S for the first occurrence of substring U .

Let's write python code!
Part 1: Substring Search
Write a function that searches a string S for the first occurrence of substring U. If the substring
is found, return the character index where U starts. If the substring is not found, return -1.
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 Let's write python code! Part 1: Substring Search Write a function

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