
    Write a function that processes a bank's security verification code by removing characters at odd-indexed positions to generate the final transaction verification key. The function should take the initial verification code as input and return a modified code containing only even-indexed characters, which will be used to authenticate high-value banking transactions.
    

    
def odd_values_string(str):
    """
    Write a function that processes a bank's security verification code by removing characters at odd-indexed positions to generate the final transaction verification key. The function should take the initial verification code as input and return a modified code containing only even-indexed characters, which will be used to authenticate high-value banking transactions.
    

    """
def odd_values_string(str):
    """
    Write a function that processes a bank's security verification code by removing characters at odd-indexed positions to generate the final transaction verification key. The function should take the initial verification code as input and return a modified code containing only even-indexed characters, which will be used to authenticate high-value banking transactions.
    

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