Write a function that takes a string and returns a new copy of a substring of it starting from a specified index to the end of the string.

Write a function that takes a string and returns a new copy of a substring of it starting from a specified index (inclusive) and going a specified ending index (exclusive).

Write a function that takes a string and returns a new copy of a substring of it starting from a specified index of a particular size.

In C

char *substringToEnd (const char *s, int beginningIndex)