# Functions
Int64ToString int64 切片转字符串
eg: Int64ToString([]int64{1, 2, 3, 4}) -> "1,2,3,4"
eg: Int64ToString([]int64{1, 2, 3, 4}, "+") -> "1+2+3+4".
IntToString int 切片转字符串
eg: IntToString([]int{1, 2, 3, 4}) -> "1,2,3,4"
eg: IntToString([]int{1, 2, 3, 4}, "+") -> "1+2+3+4".
StringToString 字符串切片转字符串
eg: StringToString(["1","2","3","4"]) -> "1,2,3,4"
eg: StringToString(["1","2","3","4"], "+") -> "1+2+3+4".