9 lines
172 B
C
9 lines
172 B
C
|
#include <stddef.h>
|
||
|
|
||
|
size_t strlen(const char* str);
|
||
|
|
||
|
char to_upper_char(char c);
|
||
|
char to_lower_char(char c);
|
||
|
char* to_lower_str(char* str);
|
||
|
char* to_upper_str(char* str);
|