Question

I have a string (ex. "one two three four"). I know that I need to cut word that starts from 4th to 6th symbol.
How can I achieve this?

Result should be:

Cut string is "two"
Result string is "one three four"

For now I achieved, that I can get the deleted word – ‘

for(i = 0; i < stringLength; ++i) { 
          if((i>=wordStart) && (i<=wordEnd))
          {
              deletedWord[j] = sentence[i];
              deletedWord[j+1] = '\0';
              j++;                
          }
    }

but when I fill the sentence[i] = '\0' I have problems with cutting string in the middle.

Answer 1

Instead of putting '\0' in the middle of the string (which actually terminates the string), copy everything but the word to a temporary string, then copy the temporary string back to the original string overwriting it.

char temp[64] = { '\0' };  /* Adjust the length as needed */

memcpy(temp, sentence, wordStart);
memcpy(temp + wordStart, sentence + wordEnd, stringLength - wordEnd);
strcpy(sentence, temp);

Edit: With memmove (as suggested) you only need one call actually:

/* +1 at end to copy the terminating '\0' */
memmove(sentence + wordStart, sentence + wordEnd, stringLengt - wordEnd + 1);