处理字符串"C1, C2, C3,C99, C100, C102,C88"成"C1-C2,C99-C102,C88"总结
假设有这样一些字符串:char*str="C1,C10,C11,C100,C101,C102,C12,C17,C54,C55,C56,C57,C58,C59,"
"C60,C61,C62,C63,C64,C65,C66,C67,C68,C69,C70,C71,C72,C73,C74,"
"C75,C76,C77,C78,C79,C80,C81,C82,C83,C84,C85,C86,C87,C88