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## printhex
### Instructions
Write a program that takes a positive (or zero) number expressed in base 10, and displays it in base 16 (with lowercase letters) followed by a newline (`'\n'`).
- If the number of parameters is different from 1, the program displays a newline.
- Error cases have to be handled as shown in the example below.
### Usage
```console
student@ubuntu:~/piscine-go/test$ go build
student@ubuntu:~/piscine-go/test$ ./test "10"
a
student@ubuntu:~/piscine-go/test$ ./test "255"
ff
student@ubuntu:~/piscine-go/test$ ./test "5156454"
4eae66
student@ubuntu:~/piscine-go/test$ ./test
student@ubuntu:~/piscine-go/test$ ./test "123 132 1" | cat -e
0$
student@ubuntu:~/piscine-go/test$
```
