
    Create a function that generates a simplified tracking code from a student's learning path identifier by keeping only the characters at even-numbered positions (0-based indexing) in the original code. The tracking code will be used to monitor student progress through different learning modules in an adaptive learning system.
    

    
def odd_values_string(str):
    """
    Create a function that generates a simplified tracking code from a student's learning path identifier by keeping only the characters at even-numbered positions (0-based indexing) in the original code. The tracking code will be used to monitor student progress through different learning modules in an adaptive learning system.
    

    """
def odd_values_string(str):
    """
    Create a function that generates a simplified tracking code from a student's learning path identifier by keeping only the characters at even-numbered positions (0-based indexing) in the original code. The tracking code will be used to monitor student progress through different learning modules in an adaptive learning system.
    

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