package main
import (
    "fmt"
    "path"
)
func main() {
    filename := "device/sdk/CMakeLists.txt"
    filenameall := path.Base(filename)    
    filesuffix := path.Ext(filename)
    fileprefix := filenameall[0:len(filenameall) - len(filesuffix)]
    //fileprefix, err := strings.TrimSuffix(filenameall, filesuffix)
    fmt.Println("file name:", filenameall)
    fmt.Println("file prefix:", fileprefix)
    fmt.Println("file suffix:", filesuffix)
}

fileprefix := filenameall[0:len(filenameall) - len(filesuffix)]

import "strings"
fileprefix, err := strings.TrimSuffix(filenameall, filesuffix)

strings.HasPrefix(s, prefix string) bool

strings.HasSuffix(s, suffix string) bool

strings.Contains(s, substr string) bool

package main
import (
        "fmt"
        "strings"
)
func main() {
        var str1 string = "This is an example of a string"
        var str2 string = "this is an "
        var str3 string = " of a string"
        fmt.Println(strings.HasPrefix(str1, str2))
        fmt.Println(strings.HasSuffix(str1, str3))
}