Submission instructions: The followings instructions should be followed assignment #05 onward. Otherwise marks will be deducted. (upto 5 for each category)
		1. Always use “myfopen” to open a file that exit the program, in case of fail to open a given file        
		2. Write use your own “myfscanf” that exits the program after throwing the error.
		3. Similarly, use your own “mymalloc”, “mymalloc”, etc., functions wherever applicable
		4. Always check validity of inputs in every function. Throw easily understandable error message.
		5. use "-Wall" during compilation to see all warnings: remove all warnings before submitting. We will deduct marks if we find unnecessary warnings. 
		6. Declaration of functions is mandatory. 
		7. Follow proper output format, if applicable