chrovr

string chrovr(int offset, string rep, string source)
// Pass: The offset in the source to overwrite from, the string to overwrite with, the source string
// Return: The string after overwrite
// Assmes: Offset is less than source length minus one (can't be last character)
{
	return left(source, offset) + rep + right(source, len(source) - offset - 1);
}