What the use of strlen in this

#1

l==1 and l==0 what does this signifies?? why the use

#2

hi @suryansh771 if l == 0 (it means no characters in the string) and if l == 1 (it means 1 character in the string) in both of these cases duplicate characters are not possible so you dont need to do any processing on this string and simply return.

#3

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