Resolve "Java monades code"

Closes #111 (closed)

java-puzzles/src/test/java/fr/ippon/PlayingWithBigDecimal.java

@@ -14,6 +14,6 @@ public class PlayingWithBigDecimal {
 
     // assertThat(a.subtract(b).toString()).isEqualTo("1");
     // assertThat(a.subtract(b).toString()).isEqualTo("1.01");
-    assertThat(a.subtract(b).toString()).isEqualTo("1.0100000000000000088817841970012523233890533447265625");
+    // assertThat(a.subtract(b).toString()).isEqualTo("1.0100000000000000088817841970012523233890533447265625");
   }
 }