import pandas as pd

def echo(df: pd.DataFrame) -> str:
    """convert pandas' dataframe to text file"""

    tmp = df.name + " < " + df.message
    values = tmp.to_csv(index=False).replace("0\n", "")
    return values

def echo_with_time(df: pd.DataFrame) -> str:
    """convert pandas' dataframe to text file with timestamp"""

    tmp = df.name + " < " + df.message + "(" + df.Time + ")"
    values = tmp.to_csv(index=False).replace("0\n", "")
    return values

def concat_dataframe(df_msg: pd.DataFrame, df_time: pd.DataFrame) -> pd.DataFrame:
    """concat messages and timestamps and convert to text file"""

    concated = df_msg.join(df_time.set_index("name"), on="name")
    return concated
f7c5d55f3b89b639f104d74d2ef84ea4b80997a4
<mask token>


def concat_dataframe(df_msg: pd.DataFrame, df_time: pd.DataFrame
    ) ->pd.DataFrame:
    """concat messages and timestamps and convert to text file"""
    concated = df_msg.join(df_time.set_index('name'), on='name')
    return concated

<mask token>


def echo(df: pd.DataFrame) ->str:
    """convert pandas' dataframe to text file"""
    tmp = df.name + ' < ' + df.message
    values = tmp.to_csv(index=False).replace('0\n', '')
    return values


<mask token>


def concat_dataframe(df_msg: pd.DataFrame, df_time: pd.DataFrame
    ) ->pd.DataFrame:
    """concat messages and timestamps and convert to text file"""
    concated = df_msg.join(df_time.set_index('name'), on='name')
    return concated

<mask token>


def echo(df: pd.DataFrame) ->str:
    """convert pandas' dataframe to text file"""
    tmp = df.name + ' < ' + df.message
    values = tmp.to_csv(index=False).replace('0\n', '')
    return values


def echo_with_time(df: pd.DataFrame) ->str:
    """convert pandas' dataframe to text file with timestamp"""
    tmp = df.name + ' < ' + df.message + '(' + df.Time + ')'
    values = tmp.to_csv(index=False).replace('0\n', '')
    return values


def concat_dataframe(df_msg: pd.DataFrame, df_time: pd.DataFrame
    ) ->pd.DataFrame:
    """concat messages and timestamps and convert to text file"""
    concated = df_msg.join(df_time.set_index('name'), on='name')
    return concated

import pandas as pd


def echo(df: pd.DataFrame) ->str:
    """convert pandas' dataframe to text file"""
    tmp = df.name + ' < ' + df.message
    values = tmp.to_csv(index=False).replace('0\n', '')
    return values


def echo_with_time(df: pd.DataFrame) ->str:
    """convert pandas' dataframe to text file with timestamp"""
    tmp = df.name + ' < ' + df.message + '(' + df.Time + ')'
    values = tmp.to_csv(index=False).replace('0\n', '')
    return values


def concat_dataframe(df_msg: pd.DataFrame, df_time: pd.DataFrame
    ) ->pd.DataFrame:
    """concat messages and timestamps and convert to text file"""
    concated = df_msg.join(df_time.set_index('name'), on='name')
    return concated

import pandas as pd

def echo(df: pd.DataFrame) -> str:
    """convert pandas' dataframe to text file"""

    tmp = df.name + " < " + df.message
    values = tmp.to_csv(index=False).replace("0\n", "")
    return values

def echo_with_time(df: pd.DataFrame) -> str:
    """convert pandas' dataframe to text file with timestamp"""

    tmp = df.name + " < " + df.message + "(" + df.Time + ")"
    values = tmp.to_csv(index=False).replace("0\n", "")
    return values

def concat_dataframe(df_msg: pd.DataFrame, df_time: pd.DataFrame) -> pd.DataFrame:
    """concat messages and timestamps and convert to text file"""

    concated = df_msg.join(df_time.set_index("name"), on="name")
    return concated