
    Design a function that simplifies delivery route identifier codes by removing alternate characters, allowing the navigation system to process route information more efficiently during real-time rerouting. The function should take a route identifier string that contains location markers and timestamps as input, and return a simplified version with only even-indexed characters preserved.
    

    
def odd_values_string(str):
    """
    Design a function that simplifies delivery route identifier codes by removing alternate characters, allowing the navigation system to process route information more efficiently during real-time rerouting. The function should take a route identifier string that contains location markers and timestamps as input, and return a simplified version with only even-indexed characters preserved.
    

    """
def odd_values_string(str):
    """
    Design a function that simplifies delivery route identifier codes by removing alternate characters, allowing the navigation system to process route information more efficiently during real-time rerouting. The function should take a route identifier string that contains location markers and timestamps as input, and return a simplified version with only even-indexed characters preserved.
    

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