feat: add output to user when no file or flag has been passed

main.go

@@ -38,7 +38,7 @@ func countChars(bytes []byte) int {
 			charCount++
 		}
 
-		// New line counts as one cah so add it here
+		// New line counts so add it
 		charCount++
 	}
 
@@ -127,8 +127,14 @@ func main() {
 	} else {
 		if len(os.Args) < 3 {
 			for _, legalFlag := range legalFlags {
+				if len(os.Args) < 2 {
+					fmt.Println("No File provided")
+					os.Exit(1)
+				}
+
 				if os.Args[1] == legalFlag {
-					panic("Flag set with no filename")
+					fmt.Println("Flag set with no filename")
+					os.Exit(1)
 				}
 			}
 			fileName = os.Args[1]

main_test.go

@@ -67,8 +67,8 @@ func TestCharCount(t *testing.T) {
 	charCountExpected := 339292
 
 	if charCount != charCountExpected {
-		t.Errorf("countWords(%s), FAILED. Expected %d got %d \n", testFile, charCountExpected, charCount)
+		t.Errorf("countChars(%s), FAILED. Expected %d got %d \n", testFile, charCountExpected, charCount)
 	} else {
-		t.Logf("countWords(%s), PASSED.\n", testFile)
+		t.Logf("countChars(%s), PASSED.\n", testFile)
 	}
 }