def trim_center_of_string(string,max_size):
    ''' 
    String: hellogoodbye 
    max_size: 8
    return hellbyes
    '''
    if len(string) >= max_size:
        # lets trim the center our long string
        length = len(string)
        excess = len(string) - max_size 
        left_imit = (length/2)-(excess/2)  # hell|os&goodbyes
        right_limit = left_imit+excess     # hellos&good|byes
        left_part = string[:left_imit]     # hell|
        right_part = string[right_limit:-1]# |byes
        string = left_part+right_part      # hellbyes
    return string