Writing a function for strings

In chapter 2, you wrote a script to process a student's grades. Now you have a lot of students' grades to process, so it's time to write a function for it.

For each student, you have text data that looks like this:

grades = "XXXX"

Where the letters "XXXX" are the grades for the student in mathematics, history, science, and drama, respectively.

A single string of grades named mygrades and an array of grade strings named grades_array is available in your environment.

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Introduction to Julia

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# Create the get_mathgrade function
____ ____(____)
	return ____
____

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