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## anagram
## **WARNING! VERY IMPORTANT!**
For this exercise a function will be tested **with the exam own main**. However the student **still needs** to submit a structured program:
This means that:
- The package needs to be named `package main`.
- The submitted code needs one declared function main(```func main()```) even if empty.
- The function main declared needs to **also pass** the `Restrictions Checker`(illegal functions tester). It is advised for the student to just empty the function main after its own testings are done.
- Every other rules are obviously the same than for a `program`.
### Instructions
Write a function that returns `true` if two strings are anagrams, otherwise returns `false`.
Anagram is a string made by using the letters of another string in a different order.
Only lower case characters will be given.
### Expected function
```go
package piscine
func IsAnagram(str1, str2 string) bool {
}
```
### Usage
Here is a possible program to test your function:
```go
package main
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import (
piscine ".."
"fmt"
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)
func main() {
test1 := piscine.IsAnagram("listen", "silent")
fmt.Println(test1)
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test2 := piscine.IsAnagram("alem", "school")
fmt.Println(test2)
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test3 := piscine.IsAnagram("neat", "a net")
fmt.Println(test3)
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test4 := piscine.IsAnagram("anna madrigal", "a man and a girl")
fmt.Println(test4)
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}
```
Its output:
```bash
$> go build
$> ./main
true
false
true
true
```