Add day40

Author: MadhavBahl

day40/README.md

@@ -3,12 +3,15 @@
 # Day 40 - Prerfix, Infix, Postfix Conversion
 
 **Infix Expression**: The expression of the form a op b. When an operator is in-between every pair of operands.
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 **Example**: ( (A * B) + (C / D) )	
 
 **Prefix Operation**: An expression is called the prefix expression if the operator appears in the expression before the operands. Simply of the form (operator operand1 operand2)
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 **Example**: (+ (* A B) (/ C D) )
 
 **Postfix Expression**: The expression of the form a b op. When an operator is followed for every pair of operands.
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 **Example**: ( (A B *) (C D /) +)
 
 ## Question 1