Rename stamp and badge to achivement · DroidKaigi/conference-app-2023@e730eab

Header comments should be consistent with project patterns (file_header)

TODOs should be resolved (Find good render way) (todo)

TODOs should be resolved (apply like flexbox layout) (todo)

Opening braces should be preceded by a single space and on the same line as the declaration (opening_brace)

Lines should not have trailing whitespace (trailing_whitespace)

TODOs should be resolved (Add to Calendar) (todo)

TODOs should be resolved (favorite) (todo)

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