Fix error in TolowerCamel when deal with strings with ID

camel.go

@@ -68,6 +68,9 @@ func ToLowerCamel(s string) string {
 	if s == "" {
 		return s
 	}
+	if strings.Index(s, "ID") != -1 {
+		s = strings.Replace(s, "ID", "Id", -1)
+	}
 	if r := rune(s[0]); r >= 'A' && r <= 'Z' {
 		s = strings.ToLower(string(r)) + s[1:]
 	}

camel_test.go

@@ -56,6 +56,8 @@ func TestToLowerCamel(t *testing.T) {
 		{"TestCase", "testCase"},
 		{"", ""},
 		{"AnyKind of_string", "anyKindOfString"},
+		{"UserID", "userId"},
+		{"ID", "id"},
 	}
 	for _, i := range cases {
 		in := i[0]