strlen(a) → get the length of astrncat(a,b,sizeOfA) → append b to a strchr(a,'a') → search for first occurence of 'a' in string astrrchr(a,'a') → search for last occurence of 'a' in string astrstr(a,b) → search for string b in astrncmp(a,b,sizeOfA) → compare strings a and bstrncpy(a,b,sizeOfA) → copy b to a (overwrite a)memcmp(a,b,FirstNBytesToCompare) → compare first n bytesmemchr(a,'a',sizeOfA) → search array a for character 'a'strtok(a,t) → tokenize string a by string t