Please help me with the following program in C?

C++ has a nice vector class that automatically adjusts an array size as needed. C does not have any such feature (until now :) ). Write a program that prompts the user for characters (not strings!). As the user enters characters ONE AT A TIME (I suggest using getchar() ), your program must call your "vector function" (that you must write) to automatically adjust the character array size to hold the input. The vector function must use malloc/calloc to create/adjust the array size. You cannot not use realloc! You may also want to read the man page on memcpy. The vector function must return a pointer (to the array) to the main routine (you will probably want to pass in the array also). This means your vector function must be of type "char *" You can adjust the array in chunks of 5 or 10 characters (vs 1 character) if you want. When the user enters "return" (in place of a character) your program must append the '\0' character to the end (making it a string). Your program must then append the new string to the text/string "HW 4 input: " (be carefull here). Your program must then print out the resulting string. getchar(); SAMPLE RUN: ----------- Enter characters: 1234567 HW 4 input: 1234567