fix: file name bug

+ Addressed issue where file names were not being properly parsed
  from the response headers.
+ Updated tests to ensure that the file name is properly parsed from
  the response headers.

src/models/ApiResponse.ts

@@ -261,13 +261,10 @@ export class ApiResponse<T> {
 
   public asFileType(response: AxiosResponse): ApiResponse<File> {
     const apiResponse = this as ApiResponse<any>;
-
-    let fileName = response.headers['content-disposition']
+    const fileName = response.headers['content-disposition']
       .split(';')[1]
       .split('=')[1];
 
-    fileName = fileName.substring(1, fileName.length - 1);
-
     const contentType =
       response.headers['content-type'] ??
       response.headers['Content-Type'] ??