Bug fix calculating amount

[0xp3gasus]

Description

Bug fix calculating amount in GetTransaction method for BTC
Fixes #88

Dependencies (if any)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

• Test A
• Test B

Test Configuration:

• Operating system (output of cat /etc/os-release):
• Kernel version (output of uname -sr):
• Architecture (output of uname -m):

Related PR or Docs PR

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Good practices to consider

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules