However, what I like to see in C are "//" style comments, declaring variables at other places than start of scope, the integer types with bit size specified, et

However, what I like to see in C are "//" style comments, declaring variables at other places than start of scope, the integer types with bit size specified, etc... All of those are already in C99... And malloc() takes more time than subtracting a variable from the stack pointer. Though VLAs have pitfalls so you probably don't want to use them outside of throw-away code anyway.