Update strings.go

strings.go

@@ -26,7 +26,7 @@ func ToUpper(b string) string {
 	return UnsafeString(res)
 }
 
-// IfToUpper returns an lowercase version of the input ASCII string.
+// IfToLower returns an lowercase version of the input ASCII string.
 //
 // It first checks if the string contains any uppercase characters before converting it.
 //