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What are the main features of the C library that I can implement to practice and improve my skills in C?

I know this sounds subjective, but I want to implement the basic library functions in C in order to better understand C (mainly in pointers) and improve my skills, as I'm just a beginner (in C and programming in general).

I also find this useful, as you better understand what is going on behind the scenes and how these basic functions work.

What are the main features of the C library I can implement? I am looking for simple ones like strcpy , atoi , strstr that are not too complicated (I'm just a beginner), but still need some thought.

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The string function always forces (and is required). Try to split the line into tokens, join the lines, replace the line in the lines. Believe me, after that not only will you become the best C programmer, you will also appreciate the open source libraries! (and C ++ STL ..) Good luck!

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After running strtok() you may need to go to the next level with qsort() and its function pointer.

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