string functions in Go

package main

import (
	"fmt"
	"strings"
	s "strings"
)

func main() {

	//to check give string has a substring
	fmt.Println(s.Contains("steve", "eve"))

	//to check no.of non-overlapping occurances os substring
	fmt.Println(s.Count("steve", "e"))

	//to check given string has a specific prefix
	fmt.Println(s.HasPrefix("Mr.Steve", "Mr"))

	//to check give give has a suffix
	fmt.Println(s.HasSuffix("Mrs.Steve Roger", "Khan"))

	//index
	fmt.Println("index", s.Index("steve", "e"))

	//join
	fmt.Println("Join: ", s.Join([]string{"a", "b"}, "-"))

	//repeat
	fmt.Println("Repeat : ", s.Repeat("a", 5))

	//split
	fmt.Println("split", s.Split("a-b-c-d-e-f", "-"))

	//lower
	fmt.Println("toLower", s.ToLower("STEVE"))

	//upper
	fmt.Println("toUpper", s.ToUpper("steve"))

	//title
	fmt.Println("title", s.Title("steve"))

	//trim
	str := " ----go is amazing!!---"
	trimChars := " -!"
	trimmedString := s.Trim(str, trimChars)
	fmt.Println("trimmed string:", trimmedString)

	//fields
	string := "go is an awesome lang"
	words := s.Fields(string)
	fmt.Println(words)

	//index of first occurance
	stringIdx := "go is a great proramming language"
	firstIdx := s.IndexAny(stringIdx, "p")
	fmt.Println(firstIdx)

	//index of last occurance
	lastIdx := s.LastIndexAny(stringIdx, "pro")
	fmt.Println(lastIdx)

	//Map
	strMapped := "hello"
	mappedString := s.Map(func(r rune) rune {
		return r + 1
	}, strMapped)

	fmt.Println("mapped string:", mappedString)

	//compare
	strComp1 := "apple"
	strComp2 := "banana"

	comparisonResult := s.Compare(strComp1, strComp2)
	fmt.Println("comparison results", comparisonResult)

	//reader
	strReader := "Hello nerds"

	reader := strings.NewReader(strReader)
	for {
		char, err := reader.ReadByte()
		if err != nil {
			break
		}
		fmt.Printf("%c", char)
	}
}