Remove duplicate file of Simple Substitution Cipher (fixes #4494) (#4495)

src/test/java/com/thealgorithms/ciphers/SimpleSubstitutionCipherTest.java

@@ -1,48 +0,0 @@
-package com.thealgorithms.ciphers;
-
-import static org.junit.jupiter.api.Assertions.assertEquals;
-
-import org.junit.jupiter.api.Test;
-
-public class SimpleSubstitutionCipherTest {
-
-    @Test
-    void testEncode() {
-        // Given
-        String message = "HELLOWORLD";
-        String key = "phqgiumeaylnofdxjkrcvstzwb";
-
-        // When
-        String actual = SimpleSubstitutionCipher.encode(message, key);
-
-        // Then
-        assertEquals("EINNDTDKNG", actual);
-    }
-
-    @Test
-    void testDecode() {
-        // Given
-        String message = "EINNDTDKNG";
-        String key = "phqgiumeaylnofdxjkrcvstzwb";
-
-        // When
-        String actual = SimpleSubstitutionCipher.decode(message, key);
-
-        // Then
-        assertEquals("HELLOWORLD", actual);
-    }
-
-    @Test
-    void testIsTextTheSameAfterEncodeAndDecode() {
-        // Given
-        String text = "HELLOWORLD";
-        String key = "phqgiumeaylnofdxjkrcvstzwb";
-
-        // When
-        String encodedText = SimpleSubstitutionCipher.encode(text, key);
-        String decodedText = SimpleSubstitutionCipher.decode(encodedText, key);
-
-        // Then
-        assertEquals(text, decodedText);
-    }
-}