[Solved] Is this an acceptable way to deallocate memory in c?

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What you’re doing will work. Each time you increment contents, you also increment counter, so contents - counter gives you the original pointer that you can free.

Of course, a better way of doing this would be to use a temporary pointer to increment through the allocated memory so you can use the original to free.

int main() {
    char *contents = read_file("testNote.txt");
    char *tmp = contents;

    while (*tmp != '\0') {

        printf("%c", *tmp);

        ++tmp;
    }

    free(contents);

    return 0;
}

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solved Is this an acceptable way to deallocate memory in c?