added the pancakesort and radix sort#516

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nimal96 wants to merge 4 commits intodubesar:masterfrom

nimal96:master

Commits on Oct 4, 2020

Commits on Oct 9, 2020

added the pancakesort and radix sort
pasan04
committed

Commits on Oct 11, 2020

added the doubly linked list file
pasan04
committed