Belajar Bahasa C – Mumbling

This time no story, no theory. The examples below show you how to write function accum:

Examples:

accum("abcd") -> "A-Bb-Ccc-Dddd"
accum("RqaEzty") -> "R-Qq-Aaa-Eeee-Zzzzz-Tttttt-Yyyyyyy"
accum("cwAt") -> "C-Ww-Aaa-Tttt"

The problem link is here.

Solution:

char *accum(const char *source)
{
  char temp;
  unsigned long i, j, mem;
  unsigned long length = strlen(source);

  mem = strlen(source);
  for (i = 0; i <= length; i++)
  {
    mem += i;
  }

  char *mumbling = calloc(mem + 1, sizeof(char));

  for (i = 0; i < length; i++)
  {
    for (j = 0; j < i + 1; j++)
    {

      temp = (j == 0) ? toupper(source[i]) : tolower(source[i]);
      strncat(mumbling, &temp, 1);
    }

    (i < length - 1) ? strncat(mumbling, "-", 1) : "";
  }
  return mumbling;
}