Create Prog2_PostfixConversion.c
Create Prog4_Queu.c
Create Prog6_String.cpp
Update Prog6_String.cpp
Rename polynomial.c to Prog1_polynomial.c
Rename evaluate_post.c to Prog3_evaluate_post.c
Rename employee.cpp to Prog5_employee.cpp
Create Prog7_stack.cpp
Create Prog8_list.cpp
Update and rename sparse.c to Prog9_sparse.c
Update and rename heap.c to Prog10_heap.c
Rename doublyLinkList.cpp to Prog11_doublyLinkList.c
Rename date.cpp to Prog12_date.cpp
Rename octal.cpp to Prog13_octal.cpp
Rename binaryTree.cpp to Prog14_binaryTree.cpp
Delete infix.c
Delete linklist.c due to duplication
Merge pull request #38 from abhi12ravi/rename

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