Remove unused method (#17042)

Author: gcatanese

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/PostmanCollectionCodegen.java

@@ -505,17 +505,6 @@ public String escapeQuotationMark(String input) {
         return input.replace("\"", "\\\"");
     }
 
-    public String doubleCurlyBraces(String str) {
-
-        // remove doublebraces first
-        String s = str.replace("{{", "{").replace("}}", "}");
-        // change all singlebraces to doublebraces
-        s = s.replace("{", "{{").replace("}", "}}");
-
-        return s;
-
-    }
-
     // convert path from /users/{id} to /users/:id
     String replacesBracesInPath(String path) {
 

modules/openapi-generator/src/test/java/org/openapitools/codegen/postman/PostmanCollectionCodegenTest.java

@@ -364,20 +364,6 @@ public void testSecuritySchemes() throws Exception {
         assertFileNotContains(path, "\"auth\": { \"type\": \"apikey\", \"apikey\": [");
     }
 
-    @Test
-    public void doubleCurlyBraces() {
-        String str = "/api/{var}/archive";
-
-        assertEquals("/api/{{var}}/archive", new PostmanCollectionCodegen().doubleCurlyBraces(str));
-    }
-
-    @Test
-    public void doubleCurlyBracesNoChanges() {
-        String str = "/api/{{var}}/archive";
-
-        assertEquals("/api/{{var}}/archive", new PostmanCollectionCodegen().doubleCurlyBraces(str));
-    }
-
     @Test
     public void extractExampleByName() {
         String str = "#/components/examples/get-user-basic";