Exception in thread "main" java.nio.charset.MalformedInputException: Input length = 1
	at java.base/java.lang.String.malformedInputException(String.java:1382)
	at java.base/java.lang.String.decodeUTF8_UTF16(String.java:1331)
	at java.base/java.lang.String.decodeUTF8_UTF16OrThrow(String.java:1220)
	at java.base/java.lang.String.newStringUTF8OrThrow(String.java:789)
	at java.base/java.lang.String.newStringOrThrow(String.java:836)
	at java.base/java.lang.System$1.uncheckedNewStringOrThrow(System.java:2153)
	at java.base/java.nio.file.Files.readString(Files.java:3050)
	at java.base/java.nio.file.Files.readString(Files.java:3010)
	at MergeEngine$Source.<init>(MergeEngine.java:72)
	at MergeEngine.load(MergeEngine.java:133)
	at MergeEngine.load(MergeEngine.java:117)
	at BugAuditTest.lambda$static$38(BugAuditTest.java:25)
	at BugAuditTest.main(BugAuditTest.java:38)
Caused by: java.lang.IllegalArgumentException: malformed input offset : 0, length : 1
	at java.base/java.lang.String.malformedInputException(String.java:1384)
	... 12 more
