Function substring( str, startIndex )

Description:
Returns the last part of a given string. The substring begins with the character at the specified index and extends to the end of this string.
Parameters:
str (String)
the input string
startIndex (integer)
the beginning index, inclusive
Return Value (String):
last part of str, omitting the first startIndex characters
Example:
substring("Galaxy", 2) = "laxy"
Signature:
String substring(String, int)