moved a subset of source file to the kern package

t_strings_test.go

@@ -6,6 +6,8 @@ package expr
 
 import (
 	"testing"
+
+	"git.portale-stac.it/go-pkg/expr/kern"
 )
 
 func TestStringsParser(t *testing.T) {
@@ -17,9 +19,9 @@ func TestStringsParser(t *testing.T) {
 		/*  4 */ {`"uno" * (2+1)`, `unounouno`, nil},
 		/*  5 */ {`"abc"[1]`, `b`, nil},
 		/*  6 */ {`#"abc"`, int64(3), nil},
-		/*  7 */ {`"192.168.0.240" / "."`, newListA("192", "168", "0", "240"), nil},
+		/*  7 */ {`"192.168.0.240" / "."`, kern.NewListA("192", "168", "0", "240"), nil},
 		/*  8 */ {`("192.168.0.240" / ".")[1]`, "168", nil},
-		/*  9 */ {`"AF3B0Dz" / 2`, newListA("AF", "3B", "0D", "z"), nil},
+		/*  9 */ {`"AF3B0Dz" / 2`, kern.NewListA("AF", "3B", "0D", "z"), nil},
 		/* 10 */ {`"AF3B0Dz" / 0`, nil, "[1:12] division by zero"},
 	}