sort package in Go

The 3 ways to sort in Go
* Sort a slice of ints, float64s or strings
  * sort.Ints
  * sort.Float64s
  * sort.Strings
* Sort with custom comparator
  * Use the function sort.Slice. It sorts a slice using a provided function less(i, j int) bool.
  * To sort the slice while keeping the original order of equal elements, use sort.SliceStable instead.
* Sort custom data structures
  * Use the generic sort.Sort and sort.Stable functions.
  * They sort any collection that implements the sort.Interface interface.
```
package main

import (
	"fmt"
	"sort"
)

func sortNumber() {
	v := []int{3, 2, 4, 1}
	sort.Ints(v)
	fmt.Println(v)
}

func sortSlice() {
	v := []struct {
		Name string
		Age  int
	}{
		{"Eve", 32},
		{"Alice", 12},
		{"Bob", 23},
	}

	sort.Slice(v, func(i int, j int) bool {
		return v[i].Age < v[j].Age
	})
	fmt.Println(v)
}

func main() {
	sortNumber()
	sortSlice()
}
```
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