Created Core module

module/Core/src/Exception/ExceptionInterface.php

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+<?php
+namespace Shlinkio\Shlink\Core\Exception;
+
+interface ExceptionInterface
+{
+}

module/Core/src/Exception/InvalidArgumentException.php

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+<?php
+namespace Shlinkio\Shlink\Core\Exception;
+
+class InvalidArgumentException extends \InvalidArgumentException implements ExceptionInterface
+{
+}

module/Core/src/Exception/InvalidShortCodeException.php

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+<?php
+namespace Shlinkio\Shlink\Core\Exception;
+
+class InvalidShortCodeException extends RuntimeException
+{
+    public static function fromShortCode($shortCode, $charSet, \Exception $previous = null)
+    {
+        $code = isset($previous) ? $previous->getCode() : -1;
+        return new static(
+            sprintf('Provided short code "%s" does not match the char set "%s"', $shortCode, $charSet),
+            $code,
+            $previous
+        );
+    }
+}

module/Core/src/Exception/InvalidUrlException.php

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+<?php
+namespace Shlinkio\Shlink\Core\Exception;
+
+class InvalidUrlException extends RuntimeException
+{
+    public static function fromUrl($url, \Exception $previous = null)
+    {
+        $code = isset($previous) ? $previous->getCode() : -1;
+        return new static(sprintf('Provided URL "%s" is not an exisitng and valid URL', $url), $code, $previous);
+    }
+}

module/Core/src/Exception/RuntimeException.php

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+<?php
+namespace Shlinkio\Shlink\Core\Exception;
+
+class RuntimeException extends \RuntimeException implements ExceptionInterface
+{
+}