Scrabble problem: Uppercase and lowercase letters

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Working on Week 2, Scrabble Lab 2.

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int compute_score(string word)
{
    int n = strlen(word);
    char temp_upper;
    int score = 0;
    for(int i = 0; i< n; i++)
    {
        temp_upper = toupper(word);
        int point_index = temp_upper - 65;
        score = score + POINTS[point_index];
    }
    return score;
}

			

 

Source: https://github.com/volkansahn/CS50-Fall2020/blob/master/Week2/Lab2/scrabble.c

I know referring blindly to answer might not be acceptable but doing so for the sake of understanding.

Here are few of the things that I need to make clear:

1. Is strlen an inbuilt function with used libraries (string.h/ctype.h) that computes length of a string?

2. temp_upper = toupper(word); Does this command converts all entered letters to uppercase letters?

3. int point_index = temp_upper – 65; All letters are converted to smallcase letters so that POINTS array can be applied?

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https://edstem.org/us/courses/176/discussion/874392?answer=1997454

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