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Count the number of vowels in a given string

**Question:**
Write a function called count_vowels that takes a string as input and returns the count of vowels (a, e, i, o, u) in the string. Use a for loop to iterate through each character in the string and count the number of vowels. Ignore case sensitivity, meaning 'A' and 'a' should be considered the same vowel.

**Example:**
Input: "Hello, World!"
Output: 3
def count_vowels(string):
    """
    Counts the number of vowels in a given string.

    Args:
    string (str): The input string.

    Returns:
    int: The count of vowels in the string.
    """
    # TODO: Implement the count_vowels function
    pass
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