Fix the following flutter issues. : 1. The body might complete normally, causing 'null' to be returned, but the return type, 'int', is a potentially non-nullable type. 2. Expected a class member. 3.Variables must be declared using the keywords 'const', 'f
Fix the following flutter issues. : 1. The body might complete normally, causing 'null' to be returned, but the return type, 'int', is a potentially non-nullable type. 2. Expected a class member. 3.Variables must be declared using the keywords 'const', 'f
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