TODO
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get values from the command line
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prompt the user and get value from the standard input
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if condition
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loops
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memory allocation and deallocation
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read and write files
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showing memory leaks
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finding memory leaks
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using external libraries
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hashes / dictionaries?
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exit in the middle of the code
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how to test C code?
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how to notice code where we might be accessing undefined values or array element that is out of index etc.
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how to avoid overflow and undeflow?