Write a function that adds two digit-strings in base b, where 2 <= b <= 10. Each string may be as long as one million digits, and strings must be of equal length. Return the sum in a string that uses the same number base. Preferred: C++

Write a C++ function to take a string s and index i as the parameters and remove the character at index i from the string s and return the modified string. The variable i will always be in the range 0 to s.length()-1.

Write a C++ function to find nth term of sequence given below, n is passed as argument to the function and function prints the nth term in output. Sequence: 1,4,9,16,25,........n2

Write a C++ function named dup that makes a copy of a user input C-string and repeats the C-string. For example, if the user inputs "HelloWorld" then it will say "HelloWorldHelloWorld" Dynamically allocate memory *(using new)* for a new C-string large enough to hold the result C-string. It should be the minimum size necessary to store the result C-string. Don't forget room for a null character!   Put the result C-string into the newly allocated memory. It must be a valid, NULL-terminated C-string. Return a pointer to the result string. The function can assume that parameter str points to a valid, NULL-terminated C-string. You can use cstring utility functions like strcpy(), strlen(), etc. if you wish, but you are not required to. Please demonstrate calling this function.   Example: dup("Giants")should return a pointer to a newly-allocated, null-terminated C-string: "GiantsGiants" char* dup(char *str)