| ft_isalpha | Checks if the character is an alphabetic character |
| ft_isdigit | Checks if the character is a digit |
| ft_isalnum | Checks if the character is an alphanumeric character |
| ft_isascii | Checks if the character is an ASCII character |
| ft_isprint | Checks if the character is a printable character |
| ft_toupper | Converts a lowercase letter to uppercase |
| ft_tolower | Converts an uppercase letter to lowercase |
| ft_strlen | Calculates the length of a string |
| ft_memset | Fills the first n bytes of the memory area pointed to by s with the constant byte c |
| ft_bzero | Writes n zeroed bytes to the string s |
| ft_memcpy | Copies n bytes from memory area src to memory area dest |
| ft_memccpy | Copies bytes from string src to string dest |
| ft_memmove | Copies n bytes from memory area src to memory area dest |
| ft_memchr | Locates the first occurrence of c (converted to an unsigned char) in string s |
| ft_memcmp | Compares byte string s1 against byte string s2 |
| ft_strlcpy | Copies up to size - 1 characters from the NUL-terminated string src to dst |
| ft_strlcat | Appends the NUL-terminated string src to the end of dst |
| ft_strchr | Locates the first occurrence of c (converted to a char) in the string pointed to by s |
| ft_strrchr | Locates the last occurrence of c (converted to a char) in the string pointed to by s |
| ft_strnstr | Locates the first occurrence of the null-terminated string little in the string big |
| ft_strncmp | Compares not more than n characters. Because strncmp() is designed for comparing strings rather than binary data, characters that appear after a `\0' character are not compared |
| ft_atoi | Converts the initial portion of the string pointed to by str to int representation |
| ft_calloc | Allocates memory for an array of nmemb elements of size bytes each and returns a pointer to the allocated memory |
| ft_strdup | Allocates sufficient memory for a copy of the string s1, does the copy, and returns a pointer to it |
