String standard functions

Functions	Description
Strlen()	Determines the length of a string
Strcpy()	Copies  a string from source to destination
Strncpy()	Copies characters of a string to another string up to the specified length
Stricmp()	Compares characters of two strings
Strcmp()	Compares characters of two strings up to the specified length
Strncmp()	Compares characters of two strings up to the specified length
Strnicmp()	Compares characters of two strings up to the specified length
Strlwr()	Converts uppercase characters of a string to lower case
Strupr()	Converts lowercase characters of a string to upper case
Strdup()	Duplicates a string
Strchr()	Determines the first occurrence of a given character in a string
Strrchr()	Determines the last occurrence of a given character in a string
Strstr()	Determines the first occurrence of a given string in another string
Strcat()	Appends source string to destination string
Strrev()	Reverses all characters of a string
Strset()	Sets all characters of a string with a given argument or symbol
Strspn()	Finds up to what length two strings are identical
Strpbrk()	Searches the first occurrence of the character in a given string and then displays the string starting from that character