merge two data frames by comparing two date columns with a condition and comparing two id columns of two different data frames

I have two data frames df1 and df2

df1:

and

df2:

what I want to do is I want exact match of c_id of the two data frame and then and if ‘dt’ of df1 minas ‘r_dt’ falls between less than 7 days, then only two data frame merges. I want the joining in "inner" ways.

My expected result will exactly look like:
result_df:

I tried it like following:

import pandas as pd
df1=pd.read_csv("my_csv1.csv")
df2=pd.read_csv("my_csv2.csv")

#merging
merge_df = pd.merge(df1,df2,how='inner',left_on=['c_id','dt'], right_on = ['c_id','r_dt'])

but this does not give me exact result. It just matches exact date, it does not compare whether day difference is less or equal 7 days or not.
Please help.