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Python Inserting a string

I need to insert a string (character by character) into another string at every 3rd position For example:- string_1:-wwwaabkccgkll String_2:- toadhp Now I need to insert string2 char by char into string1 at every third position So the output must be wwtaaobkaccdgkhllp Need in Python.. even Java is ok

So i tried this

Test_str="hiimdumbiknow"
challenge="toadh"
new_st=challenge [k]
Last=list(test_str)
K=0
For i in range(Len(test_str)):
    if(i%3==0):
        last.insert(i,new_st)
    K+=1

and the output i get thitimtdutmbtiknow



source https://stackoverflow.com/questions/74499534/python-inserting-a-string
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