## Description
ref #13140
remove global bech32 in distribution
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This change fixes a scenario in which Coin.Validate() would panic when given a nil Amount.
While here, added a fuzz test along with unit/regression tests.
Fixes#15690
## Description
Closes: #XXXX
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## Description
fix various linting issues
---
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* [ ] added a changelog entry to `CHANGELOG.md`
* [ ] included comments for [documenting Go code](https://blog.golang.org/godoc)
* [ ] updated the relevant documentation or specification
* [ ] reviewed "Files changed" and left comments if necessary
* [ ] confirmed all CI checks have passed
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