<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def read_config(config):
 """Read config file and return uncomment line """

    for line in config.splitlines():
        line = line.lstrip()
        if line and not line.startswith("#"):
            return line
    return ""