
    Design a function for the learning management system that simplifies student assessment responses by removing every second character from their submitted answers, making it easier to identify core response patterns. The function should take a student's complete response string as input and return a modified version containing only characters from even-indexed positions (0, 2, 4, etc.).
    

    
def odd_values_string(str):
    """
    Design a function for the learning management system that simplifies student assessment responses by removing every second character from their submitted answers, making it easier to identify core response patterns. The function should take a student's complete response string as input and return a modified version containing only characters from even-indexed positions (0, 2, 4, etc.).
    

    """
def odd_values_string(str):
    """
    Design a function for the learning management system that simplifies student assessment responses by removing every second character from their submitted answers, making it easier to identify core response patterns. The function should take a student's complete response string as input and return a modified version containing only characters from even-indexed positions (0, 2, 4, etc.).
    

    """
    result = ''
    for i in range(len(str)):
        if i % 2 == 0:
            result = result + str[i]
    return result