Why my test cases fails

#1

i triedall types of input but test cases are failing wht ?
and please tell correction in the code

#2

for input: aaaabc
you code will give: aabc
the mistake you have done is you pass pos+1 for next call but you have to pass same pos means
instead of this : return process(str,pos+1);
you have to write return process(str,pos);

#3

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