void str_reverse(char* buffer);
char* ultoa(unsigned long a, char* buffer, uint8_t radix);
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char* ulltoa(unsigned long long a, char* buffer, uint8_t radix);
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+char* utoa(unsigned a, char* buffer, uint8_t radix);
char* ustoa(unsigned short a, char* buffer, uint8_t radix);
// void strlwr(char* s);