C Header file Set resultString to a string value that is

C++; Header file

// ------------------------------------------------------------- //

// Set resultString[] to a string value that is a copy of a specified substring of original string s.
// If specified start position is not located within the string s, then set resultString to the empty string (\"\").
// If specified len < 0, or if (start + len) > the length of s, then set resultString to the longest possible substring.

void stringSubstring(
        char resultString[ ], // new string buffer
const int resultBuffSize, // result array buffer size
const char s[ ], // the original string
const int start, // starting position of substring within s
const int len) // length of substring within s

Solution

Hopefully this will work.

void stringSubstring(
char resultString[], // new string buffer
const int resultBuffSize, // result array buffer size
const char s[], // the original string
const int start, // starting position of substring within s
const int len) // length of substring within s
// len<0: longest possible substring
{

int slen = stringLength(s[]); // length of String s
int total = start + len;

if(start > slen){
resultString[] = \"\";
}
else{
if((len < 0) || (total > slen)){

resultString[] = substring(s[],start,slen);
}
}

}