bash: switch case flow control

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case $var in
    pattern1 )
        statements ;;
    pattern2 )
        statements ;;
        statemest ;;

Note the two consecutive semi-column ";;" which are a necessary part of the syntax!
The *) case is the default choice if none other apply.

format() {
        case "$1" in
        'banana' | 'apple' )
                echo 'It is a fruit.';;
        'cat' )
                echo 'It is an animal.';;

print_category "banana"
print_category "cat"
print_category "apple"