style: remove the main method

Author: vil02

src/main/java/com/thealgorithms/conversions/RomanToInteger.java

@@ -61,9 +61,4 @@ public static int romanToInt(String a) {
 
         return sum;
     }
-
-    public static void main(String[] args) {
-        int sum = romanToInt("MDCCCIV");
-        System.out.println(sum);
-    }
 }

src/test/java/com/thealgorithms/conversions/RomanToIntegerTest.java

@@ -11,6 +11,7 @@ public class RomanToIntegerTest {
     public void testRomanToInteger() {
         assertEquals(1994, RomanToInteger.romanToInt("MCMXCIV"));
         assertEquals(58, RomanToInteger.romanToInt("LVIII"));
+        assertEquals(1804, RomanToInteger.romanToInt("MDCCCIV"));
     }
 
     @Test