Question: write a method that returns the index of the next occurence of a substring in a string. Inputs are the string, start index, and substring.

write a method that returns the index of the next occurence of a substring in a string. Inputs are the string, start index, and substring. If not found, return -1. Do not use built-in string methods. If the input is "heyhey-friend",1,"hey", the output is 3(where the second "hey" starts).

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