Corrected issues identified by rubocop to ex25
Corrected issues identified by rubocop to ex26
Corrected issues identified by rubocop to ex29
Corrected issues identified by rubocop to ex30
Corrected issues identified by rubocop to ex31
Corrected issues identified by rubocop to ex32
Corrected issues identified by rubocop to ex34
Corrected issues identified by rubocop to ex35
Corrected issues identified by rubocop to ex38
Corrected issues identified by rubocop to ex39