[go-nuts] remove last index of character from string and also want use strings.LastIndex(s, sep string)

[long . asyn]

            var str = "a/b/c/d/c"
            // I want remove last chracter from str
            var strRunes = []rune(str)
            var newStrRunes = strRunes[0 : len(strRunes)-1]
            // then I want get last index of chracters `/c`, I need convert 
to string back!???
            strings.LastIndex(string(newStrRunes), "/c")
            // Does there have a method that LastIndex(rs []rune, s string)

Thanks for your help!

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