Style: format code by gofumpt (#761)

common/strmatcher/strmatcher_test.go

@@ -143,7 +143,7 @@ func TestACAutomaton(t *testing.T) {
 		},
 	}
 	for _, test := range cases1 {
-		var ac = NewACAutomaton()
+		ac := NewACAutomaton()
 		ac.Add(test.pattern, test.mType)
 		ac.Build()
 		if m := ac.Match(test.input); m != test.output {
@@ -176,7 +176,7 @@ func TestACAutomaton(t *testing.T) {
 				mType:   Substr,
 			},
 		}
-		var ac = NewACAutomaton()
+		ac := NewACAutomaton()
 		for _, test := range cases2Input {
 			ac.Add(test.pattern, test.mType)
 		}
@@ -239,7 +239,7 @@ func TestACAutomaton(t *testing.T) {
 				mType:   Domain,
 			},
 		}
-		var ac = NewACAutomaton()
+		ac := NewACAutomaton()
 		for _, test := range cases3Input {
 			ac.Add(test.pattern, test.mType)
 		}