4. What are the use cases for using the arrays and strings in the programs? List the available string library functions and their corresponding use cases. Write a C program to remove a requested character in the given test string and replace the empty space by a given character. Marks 25 5. Write a C program that can allocate and deallocate a two dimensional integer type of array. Draw the memory space occupied (e.g. stack, queue etc.) by the programs of 4,5