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## ztail
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### Instructions
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Write a program that behaves like a simplified `tail` command that takes at least one file as an argument.
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The only option to be handled is `-c` and will be used in all the tests as the first argument, with positive values.
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For this program the `os` package can be used.
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Handle the errors by returning a non-zero exit status but process all the files.
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If several files are given, print a newline and the file name between each one of them (see below).
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### Usage
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If `file1.txt` & `file2.txt` contains :
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```
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abcdefghijklmnopqrstuvwxyz
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```
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**Note** that the files above end with a new line.
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Normal cases :
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```console
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$ go run . -c 4 file1.txt
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xyz
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$ go run . -c 4 file1.txt file2.txt
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==> file1.txt <==
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xyz
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==> file2.txt <==
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xyz
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$
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```
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Error cases :
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```console
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$ go run . -c 4 file1.txt nonexisting1.txt file2.txt nonexisting2.txt
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==> file1.txt <==
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xyz
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open nonexisting1.txt: no such file or directory
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==> file2.txt <==
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xyz
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open nonexisting2.txt: no such file or directory
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$ echo $?
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1
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$
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```
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