chore: refactor SEP-10

[charlie-wasp]

[conventional-commit-lint-gcf[bot]]

🤖 I detect that the PR title and the commit message differ and there's only one commit. To use the PR title for the commit history, you can use Github's automerge feature with squashing, or use automerge label. Good luck human!

-- conventional-commit-lint bot https://conventionalcommits.org/

[coveralls]

Pull Request Test Coverage Report for Build 6271935013

• 14 of 15 (93.33%) changed or added relevant lines in 3 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.03%) to 94.551%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
sdk/lib/stellar/sep10.rb	0	1	0.0%
<!--	Total:	14	15

Totals
Change from base Build 6269750352:	0.03%
Covered Lines:	5184
Relevant Lines:	5360

---

💛 - Coveralls

[codacy-production[bot]]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
:white_check_mark: +0.07% (target: -1.00%)	93.33%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (1db3a01d53b0bf57ff3362c85ec5077a2987d38e)	2849	2672	93.79%
Head commit (f00a6d6a43a0d26a77e834a53b492ddf1e9734e5)	2863 (+14)	2687 (+15)	93.85% (+0.07%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#286)	15	14	93.33%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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