remove redundant startsWith and endsWith

pkg/exprhelpers/exprlib.go

@@ -24,14 +24,6 @@ func Atof(x string) float64 {
 	return ret
 }
 
-func StartsWith(s string, pref string) bool {
-	return strings.HasPrefix(s, pref)
-}
-
-func EndsWith(s string, suff string) bool {
-	return strings.HasSuffix(s, suff)
-}
-
 func Upper(s string) string {
 	return strings.ToUpper(s)
 }
@@ -39,8 +31,6 @@ func Upper(s string) string {
 func GetExprEnv(ctx map[string]interface{}) map[string]interface{} {
 	var ExprLib = map[string]interface{}{
 		"Atof":           Atof,
-		"StartsWith":     StartsWith,
-		"EndsWith":       EndsWith,
 		"JsonExtract":    JsonExtract,
 		"JsonExtractLib": JsonExtractLib,
 		"File":           File,