Sample URL is not generating correctly

[Bhavik Chavda]

Describe the bug
The sample URLs that get generated for Templates is not generating correctly.

To Reproduce
Steps to reproduce the behavior:

1. Create Project.
2. Create Template.
3. Add columns to the template
4. Get templates to see sampleFileUrl, sample file URL is showing as https://bucket.amazonaws.com//impler/638487e5f4152caeea1ac28a/sample.csv which has extra / before impler.

Expected behavior
Generated URL should be valid and publicly accessible.

Screenshots
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Desktop (please complete the following information):

• OS: Ubuntu
• Browser: Chrome
• Version v0.1.4

Additional context
Add any other context about the problem here.