
    In a busy delivery fleet management system, write a function that identifies the first unique character in a vehicle's route code to establish distinctive route markers in congested areas. The route code contains alphanumeric characters representing different zones and priorities, and the function should help dispatchers quickly identify unique route identifiers for efficient fleet coordination.
    

    
def first_non_repeating_character(str1):
    """
    In a busy delivery fleet management system, write a function that identifies the first unique character in a vehicle's route code to establish distinctive route markers in congested areas. The route code contains alphanumeric characters representing different zones and priorities, and the function should help dispatchers quickly identify unique route identifiers for efficient fleet coordination.
    

    """
def first_non_repeating_character(str1):
    """
    In a busy delivery fleet management system, write a function that identifies the first unique character in a vehicle's route code to establish distinctive route markers in congested areas. The route code contains alphanumeric characters representing different zones and priorities, and the function should help dispatchers quickly identify unique route identifiers for efficient fleet coordination.
    

    """
    char_order = []
    ctr = {}
    for c in str1:
        if c in ctr:
            ctr[c] += 1
        else:
            ctr[c] = 1
            char_order.append(c)
    for c in char_order:
        if ctr[c] == 1:
            return c
    return None