Sir, where am i doing mistake?

#1

code -> https://ide.codingblocks.com/s/458500

#2

i have removed all the errors
Modified code

but using this approach order of character will change which leads to wrong ans
for the input
axbxc
Your Output
acbxx
Correct Output
abcxx

#3

Sir, is it fine regarding time complexity ? or any other efficient solution may be happen ? please tell. code-> https://ide.codingblocks.com/s/458517

#4

this time opitmise solution but not space optimise

#5

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